ci: bump actions/checkout from 5 to 6 in the checkout-and-setup group

.github/workflows/a2a-tck-test.yml

@@ -30,7 +30,7 @@ jobs:
         run: |
           git config --global core.autocrlf input
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Set up JDK ${{ env.JAVA_VERSION }}
         uses: actions/setup-java@v5

.github/workflows/checks.yml

@@ -44,7 +44,7 @@ jobs:
       - name: Configure Git
         run: |
           git config --global core.autocrlf input
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up JDK ${{ env.JAVA_VERSION }}
         uses: actions/setup-java@v5
         with:
@@ -72,7 +72,7 @@ jobs:
       - name: Configure Git
         run: |
           git config --global core.autocrlf input
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       # Using setup-python on CI to install Python might be faster than with uv (official uv recommendation)
       - name: Set up Python
@@ -106,7 +106,7 @@ jobs:
       - name: Configure Git
         run: |
           git config --global core.autocrlf input
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up JDK ${{ env.JAVA_VERSION }}
         uses: actions/setup-java@v5
         with:
@@ -165,7 +165,7 @@ jobs:
   knit-and-dokka:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-java@v5
         with:
           distribution: ${{ env.JAVA_DISTRIBUTION }}

.github/workflows/code-agent-examples.yml

@@ -36,7 +36,7 @@ jobs:
       - name: Configure Git
         run: |
           git config --global core.autocrlf input
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up JDK ${{ env.JAVA_VERSION }}
         uses: actions/setup-java@v5
         with:

.github/workflows/dependency-submission.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Setup Java
         uses: actions/setup-java@v5
         with:

.github/workflows/deploy-all-docs.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout project
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up JDK
         uses: actions/setup-java@v5
@@ -58,7 +58,7 @@ jobs:
       - name: Configure Git
         run: |
           git config --global core.autocrlf input
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       # Using setup-python on CI to install Python might be faster than with uv (official uv recommendation)
       - name: Set up Python

.github/workflows/deploy-dokka-docs.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout project
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up JDK
         uses: actions/setup-java@v5

.github/workflows/deploy-koog-ai-docs.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Configure Git
         run: |
           git config --global core.autocrlf input
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       # Using setup-python on CI to install Python might be faster than with uv (official uv recommendation)
       - name: Set up Python

.github/workflows/heavy-tests.yml

@@ -80,7 +80,7 @@ jobs:
         run: |
           git config --global core.autocrlf input
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Set up JDK 17
         uses: actions/setup-java@v5

.github/workflows/java-api-example.yml

@@ -25,7 +25,7 @@ jobs:
       - name: Configure Git
         run: |
           git config --global core.autocrlf input
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up JDK 17
         uses: actions/setup-java@v5
         with:

.github/workflows/ollama-tests.yml

@@ -76,7 +76,7 @@ jobs:
           echo "=== Disk space after cleanup ==="
           df -h
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up JDK 17
         uses: actions/setup-java@v5
         with:

.github/workflows/simple-examples.yml

@@ -29,7 +29,7 @@ jobs:
       - name: Configure Git
         run: |
           git config --global core.autocrlf input
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up JDK ${{ env.JAVA_VERSION }}
         uses: actions/setup-java@v5
         with:
@@ -65,7 +65,7 @@ jobs:
       - name: Configure Git
         run: |
           git config --global core.autocrlf input
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up JDK ${{ env.JAVA_VERSION }}
         uses: actions/setup-java@v5
         with:

.github/workflows/spring-boot-java-example.yml

@@ -25,7 +25,7 @@ jobs:
       - name: Configure Git
         run: |
           git config --global core.autocrlf input
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up JDK 17
         uses: actions/setup-java@v5
         with:

.github/workflows/trip-planning-example.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Configure Git
         run: |
           git config --global core.autocrlf input
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up JDK 17
         uses: actions/setup-java@v5
         with: