Update phpstan/phpstan requirement from 1.6.3 to 1.6.4

[dependabot[bot]]

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

Release notes

Sourced from phpstan/phpstan's releases.

1.6.4

Improvements 🔧

• Generating baseline preserves the number of newlines at the end of the file (#1243), thanks @​VasekPurchart!
• Infer non-empty-string on literal-string and strlen() (#1260), thanks @​staabm!

Bugfixes 🐛

• AutoloadSourceLocator - fix opcache corruption (https://github.com/phpstan/phpstan-src/commit/ae53760a875a118131df949a7547fb9f1a55e904), #7151
• FileReadTrapStreamWrapper - be aware of multiple files (https://github.com/phpstan/phpstan-src/commit/28eaba24ac21097fb8f2b5f738db9c090e4d6443), #7151

Commits

• e4cd0c2 PHPStan 1.6.4
• 7063c12 Updated PHPStan to commit 5d1ee921d653848c2dfbc587713bd8c2b56a1f25
• 5d9e6fb Updated PHPStan to commit c175bb3d6063dc0cb92ddd499b64c0fe40f262b4
• c1645cb Updated PHPStan to commit 691e89adfb4f605588e8a357abbbaec79814c8fa
• 7005b7f Updated PHPStan to commit 28eaba24ac21097fb8f2b5f738db9c090e4d6443
• e050b1f Updated PHPStan to commit ae53760a875a118131df949a7547fb9f1a55e904
• 108a1ea Updated PHPStan to commit bc000e8bf2b0d51b60d173cfdf78893e66ff8cf2
• d5ef53a Updated PHPStan to commit 153e051b4e099967c6d84bd5279be9ceb1d4695f
• ae782d1 Updated PHPStan to commit c900ee2af0767ffccea864765938ddc42c43d23b
• e9f4941 Updated PHPStan to commit fc251b4c9b44b2c6d2d05c9f6875e3c5ab130891
• Additional commits viewable in compare view

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[codecov[bot]]

Codecov Report

Merging #164 (c216289) into master (9bf978c) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #164   +/-   ##
=========================================
  Coverage     94.19%   94.19%           
  Complexity       62       62           
=========================================
  Files             1        1           
  Lines           155      155           
=========================================
  Hits            146      146           
  Misses            9        9           

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