Bump phpstan/extension-installer in the phpstan-dependencies group

Bumps the phpstan-dependencies group with 1 update: [phpstan/extension-installer](https://github.com/phpstan/extension-installer).


Updates `phpstan/extension-installer` from 1.4.0 to 1.4.1
- [Release notes](https://github.com/phpstan/extension-installer/releases)
- [Commits](phpstan/extension-installer@1.4.0...1.4.1)

---
updated-dependencies:
- dependency-name: phpstan/extension-installer
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: phpstan-dependencies
...

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