Bump codecov/codecov-action from 5.5.2 to 5.5.3 (#294)

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 5.5.2 to 5.5.3.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@671740a...1af5884)

---
updated-dependencies:
- dependency-name: codecov/codecov-action
  dependency-version: 5.5.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/testing.yaml

@@ -106,7 +106,7 @@ jobs:
         # repo: https://github.com/codecov/codecov-action
         # releases: https://github.com/codecov/codecov-action/tags
         - name: "Upload coverage to Codecov"
-          uses: codecov/codecov-action@671740ac38dd9b0130fbe1cec585b89eea48d3de  # v5.5.2 released on 09-12-2025
+          uses: codecov/codecov-action@1af58845a975a7985b0beb0cbe6fbbb71a41dbad  # v5.5.2 released on 09-12-2025
           with:
               # Dependabot PRs cannot access CODECOV_TOKEN, so the upload fails even when tests pass.
               # Coverage is uploaded correctly after merge to main where the token is available.