chore(deps): update codecov/codecov-action action to v4 (#96)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/main.yml

@@ -33,7 +33,7 @@ jobs:
         run: bundle exec rspec
       - name: Upload coverage to Codecov
         if: ${{ strategy.job-index == 0 }} # only run codecov on first run
-        uses: codecov/codecov-action@v3.1.6
+        uses: codecov/codecov-action@v4.0.0
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           fail_ci_if_error: true