Update phpstan/phpstan from 0.12.8 to 0.12.9

[violinist-bot]

If you have a high test coverage index, and your tests for this pull request are passing, it should be both safe and recommended to merge this update.

Here is a list of changes between the version you use, and the version this pull request updates to:

• 297cb245 PHPStan 0.12.9
• 08f19983 E2E test for project with react/promise and parallel run
• 81cd8f49 Updated PHPStan to commit 252e81454a09917a690fe97b5f3d6a31457e157e
• 288582b9 Updated PHPStan to commit 794c491159b50b7a8442cc032f61d21632b495bb
• 013442ec Updated PHPStan to commit e59bcf55e3aefbe4318eeec9f558c92f3ae2f5e5
• d173f7e9 Fix build
• 8bbb0150 Autoloader bootstrap - save memory
• 2b6ca1b5 Updated PHPStan to commit b84acd2e3eadf66189a64fdbc6dd18ff76323f67
• 1f36c4b9 Updated PHPStan to commit 7fe02c9f177fbc33551a1bc6f575fd47305930d4
• 3b3679af TMP - skip updating playground
• 46b044d5 Update playground-runner
• f8689c82 Updated PHPStan to commit 34f8d215bb6639048a37cac4eaf982623437f6e5
• 9ada8412 Updated PHPStan to commit ecc073c976be26e8305de548ef4b50e23d561fa3
• 63a2b653 Updated PHPStan to commit b14b849d14384d7b14016fc52a3ec8cc3ffe72df
• 22d44f19 Updated PHPStan to commit 4ed486a462db3f0af17886b829e4af74910a8763
• 2e24d43a Updated PHPStan to commit f150df3292f2efc2d8be167d77cae8546ae6d397
• 0872f33c Updated PHPStan to commit 840e41980350d5f9a4a79aa914ee56b76231e8e5
• 8646718a Updated PHPStan to commit cf66e2d5f682063bb870d8e931f9c73b7b374410
• 100412f8 Updated PHPStan to commit 0fb08c94d4a2d5859b90b29e94db24f8349c86fc
• a236ea31 Updated PHPStan to commit e4ac86ef98858f8124357dcc995a2decb66d8513
• 51985355 Updated PHPStan to commit dbf136aa3cfaa5290a4d0a646c5f0e416b173403
• 82fd9980 Updated PHPStan to commit 60d61a5000df79be6946f6e12b9cd5889eed1bc2
• b4b17c14 Updated backers
• 5a145aec Updated PHPStan to commit 10979062473b3a61c84cc55066b32da7a3f10c33
• 3586047d Integration test - project with PhpStorm stubs
• 281ea0be Updated PHPStan to commit 49314cb24e45f05a396bb5af21176255e1ff7cce
• 1b8cee21 Updated PHPStan to commit 8dd2ef344cba2de918361f08fc2732a722e8fa91
• b12cb0e0 Updated PHPStan to commit 3b71993bbca5ba91b2b022c10e724bedc54ebc32
• 721f54cf Updated PHPStan to commit c8d13467ea5fe08b13359c9c59b3bebe275f892d
• cae149e3 Updated PHPStan to commit c079d8ee636ee0b210a2bc625b2da5d5e4b0d318
• cce7c5e5 Updated PHPStan to commit 4f4f3d51b92d4d71fb1db98ea0fda29cb9f47682
• ad5fa898 Updated PHPStan to commit 3eb84e21bf86988b7522c6556ad4e69bd2537330
• 54a10a6c Updated PHPStan to commit 315116007e7518750bf2cda4ceea30389bb0b899
• 871a72e1 Updated PHPStan to commit 6e440d038b8f5d51a09a8e4fc0b6d90003a103d6
• 2585f96d Updated PHPStan to commit ce4c3a14eba9759c8f9c33a1e6a79f986b0a7e44
• 0ad5dee2 Updated PHPStan to commit 9fa3aa5d44b3ec8c52c88e4e26418df22a5b419e
• 152cda42 Updated PHPStan to commit bbfac1681e08d6eb34c93b660fdf49f8bcbeb447
• 3447905a Updated PHPStan to commit c36df00c59c0e8474fd4aa0b55afca9a7f45cf35

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