Upgrade Codecov action to version 4

Updated Codecov action to version 4 and added lcov.info file upload.

Author: pat-alt

.github/workflows/CI.yml

@@ -34,10 +34,11 @@ jobs:
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1
       - uses: julia-actions/julia-processcoverage@v1
-      - name: Upload coverage
-        uses: codecov/codecov-action@v3
+      - uses: codecov/codecov-action@v4
         with:
+          files: lcov.info
           token: ${{ secrets.CODECOV_TOKEN }}
+          fail_ci_if_error: false
 
   docs:
     name: Documentation