chore(deps): update actions/checkout action to v6 (GoogleCloudPlatform#3184)

Author: renovate-bot

.github/workflows/ci-main.yaml

@@ -31,7 +31,7 @@ jobs:
   code-tests:
     runs-on: [self-hosted, is-enabled]
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: actions/setup-dotnet@v5
       env:
         DOTNET_INSTALL_DIR: "./.dotnet"
@@ -61,7 +61,7 @@ jobs:
         profile: ["local-code"]
       fail-fast: true
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Build + Deploy PR images to GKE
       timeout-minutes: 20
       run: |

.github/workflows/ci-pr.yaml

@@ -35,7 +35,7 @@ jobs:
   code-tests:
     runs-on: [self-hosted, is-enabled]
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: actions/setup-dotnet@v5
       env:
         DOTNET_INSTALL_DIR: "./.dotnet"
@@ -66,7 +66,7 @@ jobs:
         profile: ["local-code"]
       fail-fast: true
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         ref: ${{github.event.pull_request.head.sha}}
     - name: Build + Deploy PR images to GKE

.github/workflows/helm-chart-ci.yaml

@@ -28,7 +28,7 @@ jobs:
   helm-chart-ci:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: helm lint
         run: |
           cd helm-chart/

.github/workflows/kubevious-manifests-ci.yaml

@@ -33,7 +33,7 @@ jobs:
     runs-on: ubuntu-24.04
     timeout-minutes: 1
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Validate kubernetes-manifests
         id: kubernetes-manifests-validation

.github/workflows/kustomize-build-ci.yaml

@@ -28,7 +28,7 @@ jobs:
   kustomize-build-ci:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: kustomize build base
         run: |
           cd kustomize/

.github/workflows/terraform-validate-ci.yaml

@@ -28,7 +28,7 @@ jobs:
   terraform-validate-ci:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: hashicorp/setup-terraform@v3
       - name: terraform init & validate
         run: |