Update phpstan/phpstan requirement from ^0.12.85 to ^0.12.88

[dependabot[bot]]

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

Release notes

Sourced from phpstan/phpstan's releases.

0.12.88

Improvements 🔧

• ExceptionTypeResolver - support listing checked exception types (https://github.com/phpstan/phpstan-src/commit/349b3b301b5bc4c8625473dd4f9ca104b62edcf2), #4996
• Configuration parameter editorUrl to add clickable file URLs to output (#515), thanks @​ThomasLandauer!

Bugfixes 🐛

• Use 1 CPU only when proc_open function is disabled (#514), thanks @​mvorisek!
• Allow combining full and shortcut versions of excludePaths in the same config hierarchy (https://github.com/phpstan/phpstan-src/commit/e7ac788e0e5d0284f64334aaa4e2f0371f626b9a), #4561
• String starting with \ is valid class name (https://github.com/phpstan/phpstan-src/commit/428baf5f91fa623a51c236a899f308408b3d85fd), #5002
• Fix is_array() false positive (https://github.com/phpstan/phpstan-src/commit/187921e352e1d891f33a5f1f932ceaba63fa74b7), #4999
• Fix TemplateUnionType as part of intersection (https://github.com/phpstan/phpstan-src/commit/4a45db594789fe1b9cafd0d013359eba8790bd3a), #5000
• Fix PHP warning for * ignore path when open_basedir is set (#519), thanks @​mvorisek!

Function signature fixes 🤖

• functionMap: Be strict about array_flip input type (#518), thanks @​mind-bending-forks!
• Fix number_format() with named arguments (#524), thanks @​matyx!
• DateInterval extension (#520), thanks @​VincentLanglet!

Commits

• 464d1a8 PHPStan 0.12.88
• 525a99b Fix phpstan-mockery extension test
• 6d7fb64 Updated PHPStan to commit 84ea0e143ccfd200dbeda9af1ee6ae35941ae4aa
• ff96359 Updated PHPStan to commit 9c5ddc52508618df339e13bc6d7047b4198de5a7
• ef96f46 Updated PHPStan to commit d4fb41c1efacabf1d90a5a82c21edb78a779a0df
• 9418303 Updated PHPStan to commit e8ef18763df2c6226871ba3dca2a160df2bef30d
• 91d00d0 Update output-format.md
• 34ea301 Update output-format.md
• facc75c Clickable editor URL config reference
• efed263 Update output-format.md
• Additional commits viewable in compare view

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Superseded by #232.