Bump codecov/codecov-action from 2.0.3 to 2.1.0

Author: github-actions[bot]

.github/workflows/mutation-tests.yml

@@ -56,4 +56,4 @@ jobs:
         run: "make infection PHPUNIT_FLAGS=--coverage-clover=coverage.xml"
 
       - name: "Upload Code Coverage"
-        uses: "codecov/codecov-action@v2.0.3"
+        uses: "codecov/codecov-action@v2.1.0"