Bump nette/php-generator from 4.2.0 to 4.2.1

Bumps [nette/php-generator](https://github.com/nette/php-generator) from 4.2.0 to 4.2.1.
- [Release notes](https://github.com/nette/php-generator/releases)
- [Commits](nette/php-generator@v4.2.0...v4.2.1)

---
updated-dependencies:
- dependency-name: nette/php-generator
  dependency-version: 4.2.1
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]