Update deprecated codecov v3 action

Author: erikwrede

.github/workflows/tests.yml

@@ -35,4 +35,4 @@ jobs:
           if-no-files-found: error
       - name: Upload coverage.xml to codecov
         if: ${{ matrix.sql-alchemy == '1.4' && matrix.python-version == '3.10' }}
-        uses: codecov/codecov-action@v1
+        uses: codecov/codecov-action@v3