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/go.yml

@@ -11,7 +11,7 @@ jobs:
     name: lint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v9
         with:

.github/workflows/main.yml

@@ -24,7 +24,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
           logout: false
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Modify Dockerfile
         run: |
           sed -i -e "s|%VERSION%|latest|g" Dockerfile

.github/workflows/publish.yml

@@ -28,7 +28,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
           logout: false
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Modify Dockerfile
         run: |
           sed -i -e "s|%VERSION%|${{ matrix.tag }}|g" Dockerfile

.github/workflows/test.yml

@@ -26,7 +26,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
           logout: false
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Modify Dockerfile
         run: |
           sed -i -e "s|%VERSION%|latest|g" Dockerfile
@@ -46,7 +46,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Create kind cluster
         uses: helm/[email protected]
       - name: Install Helm chart for testing