ci(deps): bump actions/checkout from 4 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/amber-auto-review.yml

@@ -24,7 +24,7 @@ jobs:
 
     steps:
       - name: Checkout PR head
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: ${{ github.event.pull_request.head.repo.full_name }}
           ref: ${{ github.event.pull_request.head.ref }}

.github/workflows/amber-dependency-sync.yml

@@ -18,7 +18,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: main
           token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/amber-issue-handler.yml

@@ -45,7 +45,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
 

.github/workflows/backend-unit-tests.yml

@@ -39,7 +39,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Create reports directory
         shell: bash

.github/workflows/claude-code-review.yml

@@ -31,7 +31,7 @@ jobs:
 
     steps:
       - name: Checkout PR head
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: ${{ github.event.pull_request.head.repo.full_name }}
           ref: ${{ github.event.pull_request.head.ref }}

.github/workflows/claude.yml

@@ -38,7 +38,7 @@ jobs:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Checkout repository (fork-compatible)
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: ${{ github.event.issue.pull_request && steps.pr-info.outputs.is_fork == 'true' && format('{0}/{1}', steps.pr-info.outputs.pr_head_owner, steps.pr-info.outputs.pr_head_repo) || github.repository }}
           ref: ${{ github.event.issue.pull_request && steps.pr-info.outputs.pr_head_ref || github.ref }}

.github/workflows/components-build-deploy.yml

@@ -47,7 +47,7 @@ jobs:
       state-sync: ${{ steps.filter.outputs.state-sync }}
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: ${{ github.event.pull_request.head.sha || github.sha }}
 
@@ -106,7 +106,7 @@ jobs:
     steps:
       - name: Checkout code
         if: matrix.component.changed == 'true' || github.event.inputs.force_build_all == 'true' || contains(github.event.inputs.components, matrix.component.name) || (github.event_name == 'workflow_dispatch' && github.event.inputs.components == '' && github.event.inputs.force_build_all != 'true')
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: ${{ github.event.pull_request.head.sha || github.sha }}
 
@@ -165,7 +165,7 @@ jobs:
     if: (github.event_name == 'push' && github.ref == 'refs/heads/main') || github.event_name == 'workflow_dispatch'
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install oc
         uses: redhat-actions/oc-installer@v1
@@ -192,7 +192,7 @@ jobs:
     if: github.event_name == 'push' && github.ref == 'refs/heads/main' && (needs.detect-changes.outputs.frontend == 'true' || needs.detect-changes.outputs.backend == 'true' || needs.detect-changes.outputs.operator == 'true' || needs.detect-changes.outputs.claude-runner == 'true' || needs.detect-changes.outputs.state-sync == 'true')
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install oc
         uses: redhat-actions/oc-installer@v1
@@ -289,7 +289,7 @@ jobs:
     if: github.event_name == 'workflow_dispatch'
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install oc
         uses: redhat-actions/oc-installer@v1

.github/workflows/docs.yml

@@ -26,7 +26,7 @@ jobs:
           microdnf install -y git tar
 
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install Python and dependencies
         run: |

.github/workflows/e2e.yml

@@ -36,7 +36,7 @@ jobs:
       claude-runner: ${{ steps.filter.outputs.claude-runner }}
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Check for component changes
         uses: dorny/paths-filter@v3
@@ -60,7 +60,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Cleanup Diskspace
       id: cleanup

.github/workflows/frontend-lint.yml

@@ -38,7 +38,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up Node.js
         uses: actions/setup-node@v6