Update phpstan/phpstan requirement from ^0.12.30 to ^0.12.31

[dependabot-preview[bot]]

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

Release notes

Sourced from phpstan/phpstan's releases.

0.12.31

Bugfixes 🐛

• Subclasses of PDO are analysed using static reflection (https://github.com/phpstan/phpstan-src/commit/8390949321d55448a1a3592f6089137929252abf), #3527
• Fix problems related to conditional declarations of classes - #3522
• Dive into a trait that starts on the same line as the one in the reflection (https://github.com/phpstan/phpstan-src/commit/e6dd87bd194abcb9e49059bc7cf86ab7cf4e0366), #3460

Function signature fixes 🤖

• ZipArchive::open() returns true on success, int (error code) on failure (#253), thanks @dktapps!
• mysqli_stmt_fetch() and mysqli_stmt::fetch() can return NULL (#255), thanks @morozov!
• openssl_pkey_export() allows null for the passphrase (#256), thanks @ConradSollitt!
• Fix enchant_broker_list_dicts() return type (#257), #3530, thanks @villfa!
• correct return value for PHP internal functions on failure (#258), thanks @peter-gribanov!
• Fix return type & callback type hints for Redis::subscribe() (#259), thanks @hollodotme!

Commits

• 776c805 PHPStan 0.12.31
• 1201e95 Updated PHPStan to commit 2e612596bcd74de5b33e8f276d92cb9f169b4862
• 16c304c Updated PHPStan to commit 3902d7353fc1b8e0dc5e4b73a8d4422c8b5421bd
• 802d0c0 Reproduce issue
• 82cd1d5 Updated PHPStan to commit e6dd87bd194abcb9e49059bc7cf86ab7cf4e0366
• 5cc5a30 Updated PHPStan to commit 1cd97b4ec895fb3ea1a2101afb6a63005f52409c
• 370d9e1 Updated PHPStan to commit 73aede3bd7037e11ef1b07e3995d52722399d696
• 3bce6fe Updated PHPStan to commit 4cbb5895d9eb40645754548cbe92f69550e258ad
• 3ab6a54 Test that a function in Composer-autoloaded file is discovered
• e6101ab Reproduce Symfony issue
• Additional commits viewable in compare view

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