Bump phpstan/phpstan-webmozart-assert from 1.2.0 to 1.2.1

Bumps [phpstan/phpstan-webmozart-assert](https://github.com/phpstan/phpstan-webmozart-assert) from 1.2.0 to 1.2.1.
- [Release notes](https://github.com/phpstan/phpstan-webmozart-assert/releases)
- [Commits](phpstan/phpstan-webmozart-assert@1.2.0...1.2.1)

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

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

Author: dependabot[bot]