chore(deps): update codecov/codecov-action action to v5.4.0

Author: renovate[bot]

.github/workflows/pythonapp.yaml

@@ -39,7 +39,7 @@ jobs:
           junit_files: results.xml
           comment_mode: off
           check_name:  "Test Results - ${{ join(matrix.*, ', ') }}"
-      - uses: codecov/codecov-action@v5.3.1
+      - uses: codecov/codecov-action@v5.4.0
         env:
           PYTHON: ${{matrix.python}}
           BLEEDING_EDGE: ${{matrix.bleeding_edge}}