Bump actions/checkout from 4 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...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/docker.yml

@@ -10,7 +10,7 @@ jobs:
     permissions:
       packages: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Docker metadata
         id: meta

.github/workflows/release-win7.yml

@@ -63,7 +63,7 @@ jobs:
       CGO_ENABLED: 0
     steps:
       - name: Checkout codebase
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Show workflow information
         run: |

.github/workflows/release.yml

@@ -153,7 +153,7 @@ jobs:
       CGO_ENABLED: 0
     steps:
       - name: Checkout codebase
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up NDK
         if: matrix.goos == 'android'

.github/workflows/test.yml

@@ -45,7 +45,7 @@ jobs:
         os: [windows-latest, ubuntu-latest, macos-latest]
     steps:
       - name: Checkout codebase
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Set up Go
         uses: actions/setup-go@v5
         with: