Bump codecov/codecov-action from 2 to 4

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 2 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@v2...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/test.yaml

@@ -20,7 +20,7 @@ jobs:
       - name: Test
         run: make test
       - name: Upload Coverage to Codecov
-        uses: codecov/codecov-action@v2
+        uses: codecov/codecov-action@v4
         with:
           token: ${{ secrets.CODECOV_TOKEN }}  
   test-and-build-windows:
@@ -39,7 +39,7 @@ jobs:
       - name: Test
         run: make test
       - name: Upload Coverage to Codecov
-        uses: codecov/codecov-action@v2
+        uses: codecov/codecov-action@v4
         with:
           token: ${{ secrets.CODECOV_TOKEN }}