Bump stylelint in /examples/openfeature_web/webapp (#1356)

Bumps [stylelint](https://github.com/stylelint/stylelint) from 15.11.0 to 16.0.1.
- [Release notes](https://github.com/stylelint/stylelint/releases)
- [Changelog](https://github.com/stylelint/stylelint/blob/main/CHANGELOG.md)
- [Commits](stylelint/stylelint@15.11.0...16.0.1)

---
updated-dependencies:
- dependency-name: stylelint
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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