chore(deps): update codecov/codecov-action action to v7

Author: renovate[bot]

.github/workflows/dart.yml

@@ -58,7 +58,7 @@ jobs:
       - name: Format coverage
         run: dart pub global run coverage:format_coverage --lcov --in=coverage.json --out=lcov.info --report-on=lib
 
-      - uses: codecov/codecov-action@v4.5.0
+      - uses: codecov/codecov-action@v7.0.0
         with:
           fail_ci_if_error: true # optional (default = false)
           token: ${{ secrets.CODECOV_TOKEN }} # required