Chore: Bump actions/checkout from 5 to 6 (#610)

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](https://github.com/actions/checkout/compare/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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/build-docker-edge.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Set up QEMU
       uses: docker/setup-qemu-action@v3

.github/workflows/build-docker.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Set up QEMU
       uses: docker/setup-qemu-action@v3

.github/workflows/codeql-analysis.yml

@@ -38,7 +38,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL

.github/workflows/release-build.yml

@@ -21,7 +21,7 @@ jobs:
           - goarch: arm
             goos: windows
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     # build the assets
     - uses: actions/setup-node@v5

.github/workflows/tests-rqlite.yml

@@ -17,7 +17,7 @@ jobs:
           # the HTTP address the rqlite node should advertise
           HTTP_ADV_ADDR: "localhost:4001"
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup Go
         uses: actions/setup-go@v6
         with:

.github/workflows/tests.yml

@@ -16,7 +16,7 @@ jobs:
       with:
         go-version: ${{ matrix.go-version }}
         cache: false
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Set up Go environment
       uses: actions/cache@v4
       with: