Bump phpstan/phpstan from 0.12.93 to 0.12.94 in /tools

Bumps [phpstan/phpstan](https://github.com/phpstan/phpstan) from 0.12.93 to 0.12.94.
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Commits](phpstan/phpstan@0.12.93...0.12.94)

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

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

Author: dependabot[bot]