Bump sersoft-gmbh/swift-coverage-action from 3 to 4

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](https://github.com/sersoft-gmbh/swift-coverage-action/compare/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>

.github/workflows/unit-tests.yml

@@ -20,7 +20,7 @@ jobs:
       - uses: actions/checkout@v4
       - name: Run SwiftPM Tests
         run: swift test --enable-code-coverage --parallel
-      - uses: sersoft-gmbh/swift-coverage-action@v3
+      - uses: sersoft-gmbh/swift-coverage-action@v4
         id: coverage-files
       - uses: codecov/codecov-action@v3
         with:
@@ -76,7 +76,7 @@ jobs:
           parallel-testing-enabled: true
           build-settings: GCC_GENERATE_TEST_COVERAGE_FILES=YES
           action: test
-      - uses: sersoft-gmbh/swift-coverage-action@v3
+      - uses: sersoft-gmbh/swift-coverage-action@v4
         id: coverage-files
       - uses: codecov/codecov-action@v3
         with: