Merge pull request #15 from codecov/update-to-v4

chore(ci): upgrade to v4

Author: thomasrockhu-codecov

.github/workflows/cpp-11-standard.yml

@@ -30,7 +30,7 @@ jobs:
           ./TestBinary
           gcov -o . test/test_index.cpp
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v4-beta
+        uses: codecov/codecov-action@v4
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
       - name: Test coverage percentage