Bump codecov/codecov-action from 3 to 4

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 3 to 4.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v3...v4)

---
updated-dependencies:
- dependency-name: codecov/codecov-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/swift-test.yml

@@ -59,7 +59,7 @@ jobs:
       - name: Generate Coverage Files
         uses: sersoft-gmbh/swift-coverage-action@v3
         id: coverage-files
-      - uses: codecov/codecov-action@v3
+      - uses: codecov/codecov-action@v4
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           files: ${{ join(fromJSON(steps.coverage-files.outputs.files), ',') }}
@@ -139,7 +139,7 @@ jobs:
             ./.build
             ./.derived-data
             $HOME/Library/Developer/Xcode/DerivedData
-      - uses: codecov/codecov-action@v3
+      - uses: codecov/codecov-action@v4
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           files: ${{ join(fromJSON(steps.coverage-files.outputs.files), ',') }}