patch 8.2.2192: Codecov on github actions fails

Problem:    Codecov on github actions fails.
Solution:   Revert to codecov script. (Ozaki Kiichi, closes #7529)

.github/workflows/ci.yml

@@ -214,11 +214,9 @@ jobs:
 
       - name: Codecov
         if: matrix.coverage && success()
-        uses: codecov/codecov-action@v1
-        with:
-          flags: ${{ matrix.features }}-${{ matrix.compiler }}-${{ matrix.extra }}
-          fail_ci_if_error: true
-          working-directory: ${{ env.SRCDIR }}
+        run: |
+          cd "${SRCDIR}"
+          bash <(curl -s https://codecov.io/bash) -F "${{ matrix.features }}-${{ matrix.compiler }}-${{ matrix.extra }}"
 
       - name: ASan logs
         if: contains(matrix.extra, 'asan') && !cancelled()