Update phpstan/phpstan requirement from 0.12.90 to 0.12.91

[dependabot]

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

Release notes

Sourced from phpstan/phpstan's releases.

0.12.91

Improvements 🔧

• Infer parameter types in arrow functions (phpstan/phpstan-src@8fdc2d3), #4902, #3660, #4083, #4681
• Use the same php.ini in child workers (#559), thanks @​yangchaobj!
• strval() dynamic return type extension (#568), thanks @​jlherren!
• Type cast fixes, add tests for intval(), boolval(), floatval() (#570), #4848, #5162, thanks @​jlherren!
• next() dynamic return type extension (phpstan/phpstan-src@599f59b), #5253
• Update nikic/php-parser to 4.11.0 (phpstan/phpstan-src@e42ae89)

Bugfixes 🐛

• ConstantArrayTypeBuilder - preserve non-emptiness in generalized array (phpstan/phpstan-src@427b73d), #5219, #4829, #4844
• Support object for ReflectionClass and ReflectionMethod constructor throw types (#566), #5195, thanks @​VincentLanglet!
• Fix for: Optional array key is not recognized with !empty (#569), #3784, #3700, #3297, thanks @​ArtemGoutsoul!

Commits

• 8226701 PHPStan 0.12.91
• 41b1677 Updated PHPStan to commit 3c3ea2f21898e8e411b0a7263910722738839288
• 5666d2b Updated PHPStan to commit 4a3ffab7ec33edf10f16e904ca8eb0d4e710b915
• d6d57f2 Updated PHPStan to commit e42ae89604985a3861e4a62c1d932374e5f72956
• 137ba3a Updated PHPStan to commit 599f59bbc63ad95922367f1b3f86b75f2cda5021
• a3fb64a Updated PHPStan to commit d675602d1eae1cfae1c189eb5b14a6978c96b7df
• 811d6f9 Bump league/commonmark from 1.6.2 to 1.6.5 in /issue-bot
• a24c57d Bump phpunit/phpunit from 9.5.5 to 9.5.6 in /issue-bot
• dd2a666 Bump phpstan/phpstan from 0.12.89 to 0.12.90 in /playground-runner
• e908bba Bump socket.io-parser from 3.3.0 to 3.3.2 in /playground-api
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[codecov]

Codecov Report

Merging #87 (a2ff994) into master (eecc9ef) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #87   +/-   ##
=======================================
  Coverage   96.45%   96.45%           
=======================================
  Files           9        9           
  Lines         141      141           
=======================================
  Hits          136      136           
  Misses          5        5           

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