Bump symfony/polyfill-mbstring from 1.33.0 to 1.35.0

Bumps [symfony/polyfill-mbstring](https://github.com/symfony/polyfill-mbstring) from 1.33.0 to 1.35.0.
- [Release notes](https://github.com/symfony/polyfill-mbstring/releases)
- [Commits](symfony/polyfill-mbstring@v1.33.0...v1.35.0)

---
updated-dependencies:
- dependency-name: symfony/polyfill-mbstring
  dependency-version: 1.35.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]