build(deps): bump the dependencies group with 2 updates

Bumps the dependencies group with 2 updates: [symfony/polyfill-iconv](https://github.com/symfony/polyfill-iconv) and [symfony/polyfill-mbstring](https://github.com/symfony/polyfill-mbstring).


Updates `symfony/polyfill-iconv` from 1.29.0 to 1.30.0
- [Commits](symfony/polyfill-iconv@v1.29.0...v1.30.0)

Updates `symfony/polyfill-mbstring` from 1.29.0 to 1.30.0
- [Commits](symfony/polyfill-mbstring@v1.29.0...v1.30.0)

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

Signed-off-by: dependabot[bot] <[email protected]>