Update phpstan/phpstan requirement from ^1.4 to ^1.5

[dependabot[bot]]

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

Release notes

Sourced from phpstan/phpstan's releases.

1.5.3

Improvements 🔧

• Update phpdoc-parser with multi-line union/intersection/conditional types support (https://github.com/phpstan/phpstan-src/commit/6fa7c9097d060e7eddd81adf7a6809eb94a221a6), phpstan/phpdoc-parser#114, thanks @​rvanvelzen!

Bugfixes 🐛

• Mark Memcached::HAVE_* constants as dynamic (#1142), #6263, thanks @​VasekPurchart!
• Improve return types for array_fill_keys and array_combine (#1139), thanks @​canvural!
• Guard Equal (==) expression specification with empty array on both sides (#1143), #6940, thanks @​herndlm!
• Fix huge union types result from "+"-array-merge operation (#1141), #6936, thanks @​staabm!
• Improve return type of array_fill_keys for not constant arrays (#1145), thanks @​canvural!
• Handle false return in substr() with PHP < 8 (#1144), #6939, thanks @​herndlm!
• array_merge lost non-empty-string keys type (#1135), #6927, #5846, #2567, thanks @​staabm!

Commits

• 39953ac PHPStan 1.5.3
• f71b64c Update Composer baseline
• 5cc28c0 Fix Slevomat CS build
• 5c2e860 Fix Nextras build
• bf9eedc Updated PHPStan to commit 565248deba4f553011f77ee8f512e53ff453a795
• 689408b Updated PHPStan to commit ae67ac8674253c877b0bb480ed780c6c44fb4e5f
• fb718cd Updated PHPStan to commit 3e69c480ff8c7efe5415944938ecd0d5bc3b7008
• e1d2004 Updated PHPStan to commit 925eabb4ca12f5b588f84dcf726958084734fcdf
• 409c17b Updated PHPStan to commit 9571283ce589afa757e341c02be4fb39326c155e
• 2239f6a Updated PHPStan to commit 6fa7c9097d060e7eddd81adf7a6809eb94a221a6
• Additional commits viewable in compare view

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