patch 8.2.4768: CI: codecov upload sometimes does not work

Problem:    CI: codecov upload sometimes does not work.
Solution:   Use action v3 instead of v2. (closes #10209)
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4bb5e29..bdeb918 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -254,7 +254,7 @@
 
       - name: Codecov
         if: matrix.coverage
-        uses: codecov/codecov-action@v2
+        uses: codecov/codecov-action@v3
         with:
           flags: linux,${{ matrix.features }}-${{ matrix.compiler }}-${{ matrix.extra }}