Build(deps): Update phpstan/phpstan-mockery requirement from ^0.12.5 to ^0.12.12 in /.build

[dependabot-preview[bot]]

Updates the requirements on phpstan/phpstan-mockery to permit the latest version.

Release notes

Sourced from phpstan/phpstan-mockery's releases.

0.12.12

• ebf744d - Dependabot
• 053bf9e - Support shouldNotReceive

Commits

• 053bf9e Support shouldNotReceive
• ebf744d Dependabot
• 6e8917e Fix type hint of $methodNames argument in MockInterface.stub
• a3a1b7e Update CS
• ca4fff3 Different changelog action
• ee69a9c Fix
• 42e15d9 Test release
• 1ef749c Update tag
• 52a91ff Release workflow
• c3b6ef5 Use GitHub Actions instead of Travis CI
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

Dependabot will not automatically merge this PR because this dependency is pre-1.0.0.

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[dependabot-preview[bot]]

Dependabot tried to update this pull request, but something went wrong. The most likely cause is #303, which may be blocking Dependabot from updating your dependency files.

[dependabot-preview[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.