build(deps): bump sersoft-gmbh/swift-coverage-action from 3 to 4 (#50)

Bumps [sersoft-gmbh/swift-coverage-action](https://github.com/sersoft-gmbh/swift-coverage-action) from 3 to 4.
- [Release notes](https://github.com/sersoft-gmbh/swift-coverage-action/releases)
- [Commits](sersoft-gmbh/swift-coverage-action@v3...v4)

---
updated-dependencies:
- dependency-name: sersoft-gmbh/swift-coverage-action
  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>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -28,7 +28,7 @@ jobs:
       env:
           DEVELOPER_DIR: ${{ env.CI_XCODE }}
     - name: Prepare codecov
-      uses: sersoft-gmbh/swift-coverage-action@v3
+      uses: sersoft-gmbh/swift-coverage-action@v4
       id: coverage-files
       with:
         format: lcov