build: (deps): 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](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>

.github/workflows/release.yaml

@@ -17,7 +17,7 @@ jobs:
   build_web:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: cat .github/workflows/versions.env >> $GITHUB_ENV
       - uses: subosito/flutter-action@v2
         with:
@@ -72,7 +72,7 @@ jobs:
   build_apk:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: cat .github/workflows/versions.env >> $GITHUB_ENV
       - uses: actions/setup-java@v5
         with:
@@ -112,7 +112,7 @@ jobs:
         arch: [ x64, arm64 ]
     runs-on: ${{ matrix.arch == 'arm64' && 'ubuntu-24.04-arm' || 'ubuntu-latest'}}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: cat .github/workflows/versions.env >> $GITHUB_ENV
       - name: Install dependencies
         run: sudo apt-get update && sudo apt-get install curl clang cmake ninja-build pkg-config libgtk-3-dev libblkid-dev liblzma-dev libjsoncpp-dev cmake-data libsecret-1-dev libsecret-1-0 librhash0 libssl-dev libwebkit2gtk-4.1-dev -y
@@ -138,7 +138,7 @@ jobs:
   deploy_playstore:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: cat .github/workflows/versions.env >> $GITHUB_ENV
       - uses: actions/setup-java@v5
         with:
@@ -195,7 +195,7 @@ jobs:
       packages: write
     steps:
       - name: Check out Git repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Log in to the Container registry
         uses: docker/login-action@v3
         with: