Bump codecov/codecov-action from 1 to 4

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 1 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@v1...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/go.yml

@@ -28,7 +28,7 @@ jobs:
       run: make test-unit
 
     - name: Codecov
-      uses: codecov/codecov-action@v1
+      uses: codecov/codecov-action@v4
       with:
         file: .coverage/coverage_unit.txt
         flags: unit-tests
@@ -51,7 +51,7 @@ jobs:
       run: make test-integration
 
     - name: Codecov
-      uses: codecov/codecov-action@v1
+      uses: codecov/codecov-action@v4
       with:
         file: .coverage/coverage_integration.txt
         flags: integration-tests