chore(deps): bump actions/checkout from 4 to 7 (#155)

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 7.
- [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/v4...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  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.yml

@@ -37,7 +37,7 @@ jobs:
             pkg-config
 
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v7
         with:
           fetch-depth: 0
 
@@ -139,7 +139,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v7
 
       - name: Setup GPG
         id: gpg
@@ -156,7 +156,7 @@ jobs:
           merge-multiple: true
 
       - name: Checkout existing gh-pages
-        uses: actions/checkout@v4
+        uses: actions/checkout@v7
         with:
           ref: gh-pages
           path: gh-pages-branch
@@ -225,7 +225,7 @@ jobs:
       options: --privileged
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
 
       - name: Build Flatpak
         uses: flatpak/flatpak-github-actions/flatpak-builder@v6