Update phpstan/phpstan requirement from ^0.12.88 to ^1.3.1

[dependabot[bot]]

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

Release notes

Sourced from phpstan/phpstan's releases.

1.3.1

Bugfixes 🐛

• Fixed mixed type not considered nullable (https://github.com/phpstan/phpstan-src/commit/c0aad86b543c97ce00e012f0092c22fa96728f35), #6293, #6158
• Fix renamed trait method visibility (https://github.com/phpstan/phpstan-src/commit/fc5be6a991e355094a97c3b9cdc27ff39284f192), #6264
• Fix PDO::pgsqlGetNotify() call (https://github.com/phpstan/phpstan-src/commit/3624bbb2c47c997f2048cc490854e32bb7a77e92), #6255
• Fix PHPDocs in file with #! shebang (https://github.com/phpstan/phpstan-src/commit/c87284a8eafcea2fde391b69a29daa8f4a0adf37), #6252
• Fix infinite recursion in @mixin extensions (https://github.com/phpstan/phpstan-src/commit/9ab4e6fd8ef29d7bf7b0b729250e04f3dd5ad75d), #6300

Function signature fixes 🤖

• Fix return type of SessionHandler::gc() (#899), thanks @​Khartir!
• added preg_quote to NonEmptyStringFunctionsReturnTypeExtension (#881), thanks @​staabm!
• Support non-empty-string type in string-replace functions (#879), thanks @​staabm!
• uniqid() always returns a non-empty-string (#905), thanks @​MidnightDesign!

Commits

• c3e7a58 PHPStan 1.3.1
• f943b7b Updated PHPStan to commit 13047ff2264f7672ad819470b6a801283f353aa8
• 5eb288c Updated PHPStan to commit b60f022c874528e065b38d6e4eebea9ce49111c1
• 99bff70 Another fix
• 5862ab2 Try fixing phpstan-doctrine build in test-extension.sh
• 8a4b6b2 Revert "Try fixing phpstan-doctrine build"
• 540cfe3 Updated PHPStan to commit b535392e798de098fc3f4bff78195c1ba9a1ff0e
• 6911224 Try fixing phpstan-doctrine build
• 9fcac3f Update BetterReflection integration test
• f002b0b Updated PHPStan to commit 9ab4e6fd8ef29d7bf7b0b729250e04f3dd5ad75d
• Additional commits viewable in compare view

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Superseded by #57.