[gh-actions](deps): Bump actions/checkout from 5 to 6

.github/workflows/base-tests.yaml

@@ -15,7 +15,7 @@ jobs:
           - ubuntu-latest
     steps:
       - name: Check out repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install dependencies (Ubuntu)
         if: startsWith(matrix.os, 'ubuntu')

.github/workflows/claude.yml

@@ -25,7 +25,7 @@ jobs:
       id-token: write
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 1
 

.github/workflows/codespell.yml

@@ -14,6 +14,6 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Codespell
         uses: codespell-project/actions-codespell@v2

.github/workflows/tests.yaml

@@ -25,7 +25,7 @@ jobs:
 
 
     - name: Checkout this repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Test example in the README.md
       run: scripts/run-README-example

.github/workflows/typing.yaml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v6