chore(deps): bump actions/checkout from 4 to 7 (#4297)

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [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/opencode-plugin-ci.yml

@@ -32,7 +32,7 @@ jobs:
       matrix:
         node: ["22", "24"]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
         with:
           persist-credentials: false
       - uses: actions/setup-node@v6
@@ -49,7 +49,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: test
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
         with:
           persist-credentials: false
       - uses: actions/setup-node@v6