upgrade codecov/codecov-action from v3 to v4 (#1728)

Co-authored-by: Cijo Thomas <[email protected]>

Author: lalitb

.github/workflows/ci.yml

@@ -150,6 +150,6 @@ jobs:
       - name: cargo llvm-cov
         run: cargo llvm-cov --locked --all-features --workspace --lcov --output-path lcov.info
       - name: Upload to codecov.io
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4
         with:
-          fail_ci_if_error: false
+          fail_ci_if_error: true