Update phpstan/phpstan requirement from ^0.12.32 to ^1.4.8

[dependabot[bot]]

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

Release notes

Sourced from phpstan/phpstan's releases.

1.4.8

Improvements 🔧

• Validate ignoreErrors regexes during DIC compilation (save time in each run) (https://github.com/phpstan/phpstan-src/commit/692158c194eff722167f5316d31369a188a88a72), #6693
• Validate parametersSchema only during DIC compilation (https://github.com/phpstan/phpstan-src/commit/50f25e95ad2f99d9fb73e512ac9b54599653305b)
• Retain left and right types in == and === expression (#1046), thanks @​herndlm!
• Add support for integer ranges in strtotime() with constant strings (#1045), thanks @​Seldaek!

Bugfixes 🐛

• Fix is_subclass_of with same class (#1044), #6305, thanks @​herndlm!
• Fix Incorrectly nested style tag found for narrow terminals (https://github.com/phpstan/phpstan-src/commit/d921d067702acb1cc0451753dcdf3be142b29aed), #6724, #6727
• Empty array infers key and value type as never (https://github.com/phpstan/phpstan-src/commit/c2b9e713daa09db18111d28ba5c8cd79beeaeec5), #3400, #6353, #5757, #5065
• ArrayType::traverse() - create empty ConstantArrayType in case of never (https://github.com/phpstan/phpstan-src/commit/8c1dfc1afb3f381c8e50befe38e8abc581c67db2)

Commits

• 2a6d670 PHPStan 1.4.8
• a807a3f Updated PHPStan to commit 156cb69be747b7821275803717ef840fae636602
• db64d2c Updated PHPStan to commit d3179f4dcdaeaef1dd57a796f7c6a7a74242a8d3
• 2559eff Updated PHPStan to commit 98ee71561c35dab46b626d467b7135e9e7875810
• 1e699ce Updated PHPStan to commit 3581d69cc8b4c248476a242e73e65c94458d66ee
• c083294 Updated PHPStan to commit 0a8ac3d754ab555b40bd8914b4d4084fee2b04d3
• 445c882 Updated PHPStan to commit a84465bb2b4b69df2a81eef943843f50ee08282f
• 5091ab0 Updated PHPStan to commit c2b9e713daa09db18111d28ba5c8cd79beeaeec5
• 16d01e7 Updated PHPStan to commit 1658bf34e27914c0ff2cea99622321415d774046
• 10cca0c Updated PHPStan to commit d921d067702acb1cc0451753dcdf3be142b29aed
• Additional commits viewable in compare view

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Superseded by #240.