Upgrade Codecov action to version 5

Author: mossr

.github/workflows/CI.yml

@@ -34,6 +34,8 @@ jobs:
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1
       - uses: julia-actions/julia-processcoverage@v1
-      - uses: codecov/codecov-action@v3
+      - uses: codecov/codecov-action@v5
         with:
           files: lcov.info
+          token: ${{ secrets.CODECOV_TOKEN }}
+