chore(deps): bump phpstan/phpstan-mockery from 0.12.12 to 0.12.13 (#48)

Bumps [phpstan/phpstan-mockery](https://github.com/phpstan/phpstan-mockery) from 0.12.12 to 0.12.13.
- [Release notes](https://github.com/phpstan/phpstan-mockery/releases)
- [Commits](phpstan/phpstan-mockery@0.12.12...0.12.13)

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