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] <support@github.com>

Author: dependabot[bot]

.github/workflows/build-check.yaml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Source Code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Run GoReleaser Check
         uses: goreleaser/goreleaser-action@v6

.github/workflows/e2e.yaml

@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           submodules: recursive
       - name: Setup Go and ko

.github/workflows/release.yml

@@ -21,7 +21,7 @@ jobs:
       contents: write # To be able to update releases
     steps:
     - name: Check out code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         ref: ${{ inputs.git-ref }}
         fetch-depth: 0

.github/workflows/unit.yaml

@@ -15,7 +15,7 @@ jobs:
   test-unit:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: ./.github/actions/setup
 
       - name: Run Unit Tests

.github/workflows/verify.yaml

@@ -17,7 +17,7 @@ jobs:
   verify:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: ./.github/actions/setup
 
       - name: Run golangci-lint