Bump vladopajic/go-test-coverage from 2.18.3 to 2.18.4

Bumps [vladopajic/go-test-coverage](https://github.com/vladopajic/go-test-coverage) from 2.18.3 to 2.18.4.
- [Release notes](https://github.com/vladopajic/go-test-coverage/releases)
- [Commits](vladopajic/go-test-coverage@v2.18.3...v2.18.4)

---
updated-dependencies:
- dependency-name: vladopajic/go-test-coverage
  dependency-version: 2.18.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/test.yml

@@ -26,6 +26,6 @@ jobs:
           go-version: ${{ matrix.go-version }}
       - run: go test -v -coverprofile="coverage.out" ./...
       - run: go tool cover -func="coverage.out"
-      - uses: vladopajic/go-test-coverage@v2.18.3
+      - uses: vladopajic/go-test-coverage@v2.18.4
         with:
           config: ".github/testcoverage.yml"