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.yml

@@ -25,7 +25,7 @@ jobs:
       - uses: actions/setup-go@v5
         with:
           go-version: 1.25
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: make build
       - uses: actions/upload-artifact@v5
         with:
@@ -43,7 +43,7 @@ jobs:
       - uses: actions/setup-go@v5
         with:
           go-version: 1.25
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - env:
           VIMEO_TEST_API_KEY: ${{ secrets.VIMEO_ACCESS_TOKEN }}
           YOUTUBE_TEST_API_KEY: ${{ secrets.YOUTUBE_API_KEY }}
@@ -61,7 +61,7 @@ jobs:
 
     steps:
       - uses: actions/setup-go@v5
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: golangci/golangci-lint-action@v9
 
       - name: Go mod

.github/workflows/claude.yml

@@ -28,7 +28,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Run Claude Code
         id: claude

.github/workflows/dedup.yml

@@ -16,7 +16,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 1
 

.github/workflows/nightly.yml

@@ -23,7 +23,7 @@ jobs:
 
     steps:
       - name: 📦 Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: 🧪 Set up Docker Buildx
         uses: docker/setup-buildx-action@v3

.github/workflows/release.yml

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

.github/workflows/triage.yml

@@ -15,7 +15,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0