ci(deps): bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...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/ci-act.yml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     # Act-compatible Python and uv setup
     - name: Set up Python (Act compatible)
@@ -94,7 +94,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     # Act-compatible Python and uv setup
     - name: Set up Python
@@ -131,7 +131,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     # Act-compatible Python and uv setup
     - name: Set up Python
@@ -161,7 +161,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         fetch-depth: 0
 
@@ -179,7 +179,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     # Act-compatible Python and uv setup
     - name: Set up Python
@@ -216,7 +216,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Set up Docker Buildx
       if: ${{ !env.ACT }}

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Install uv
       uses: astral-sh/setup-uv@v6
@@ -48,7 +48,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Install uv
       uses: astral-sh/setup-uv@v6
@@ -82,7 +82,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         fetch-depth: 0  # Full history for gitleaks
 
@@ -109,7 +109,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         fetch-depth: 0  # Full history for gitleaks
 
@@ -127,7 +127,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Install uv
       uses: astral-sh/setup-uv@v6
@@ -164,7 +164,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Set up Docker Buildx
       uses: docker/setup-buildx-action@v3

.github/workflows/prepare-release.yml

@@ -21,7 +21,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
           persist-credentials: false

.github/workflows/release-e2e.yml

@@ -20,7 +20,7 @@ jobs:
       id-token: write
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
           persist-credentials: false

.github/workflows/release.yml

@@ -18,7 +18,7 @@ jobs:
       contents: read
       id-token: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - uses: astral-sh/setup-uv@v6
@@ -70,7 +70,7 @@ jobs:
       contents: read
       packages: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Extract version from tag
         id: ver
         run: |
@@ -110,7 +110,7 @@ jobs:
     permissions:
       contents: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Generate changelog
@@ -137,7 +137,7 @@ jobs:
       id-token: write
     continue-on-error: true
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Extract version from tag
         id: ver
         run: |