Update phpstan/phpstan requirement from ^0.12.99 to ^1.4.4

[dependabot[bot]]

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

Release notes

Sourced from phpstan/phpstan's releases.

1.4.4

Improvements 🔧

• Return type extension for array_column() (#948), thanks @​jlherren!
• Generic stub for DatePeriod + constructor dynamic return type extension (#958), #5953, thanks @​Alban-io!
• Resolve remaining predefined constants (#693), thanks @​herndlm!

Bugfixes 🐛

• Support all array_filter() flags for narrowing down types (#941), thanks @​herndlm!
• Fix error The supplied range exceeds the maximum array size (#934), #6375, thanks @​voku!
• Nullable union template type bound is actually supported (https://github.com/phpstan/phpstan-src/commit/1d8b2eb269b1de8c449b372580852c2a6307c323), #4656, #5305, #3384
• Fix reporting nonexistent offset in isset() (https://github.com/phpstan/phpstan-src/commit/f05e8eb8fe3d979afa9e627371f4df92ab28fadf), #4926
• Fix interaction between template type and intersection type (#955), #6210, thanks @​arnaud-lb!
• Fix tests on 32-bit (#957), thanks @​herndlm!
• Fix resolving type of isset(), empty() and null coalesce operator (??) (https://github.com/phpstan/phpstan-src/commit/3b17acc5de4ac507d678f9ca9b2cd15937921ffb), #4592, #4903, #2420, #2718, #3126, #4586, #4887

Function signature fixes 🤖

• Narrow down the return type of the Throwable::getTrace() method (#914), thanks @​ste93cry!
• Fix DOMDocument::saveXML signature (#956), thanks @​kissifrot!

Commits

• f7409da PHPStan 1.4.4
• 305c15a Updated PHPStan to commit c17a331f2c1e06bb1614b44645649fd3f27b4dd1
• a9b1536 Update PHPUnit baseline
• cb42315 Updated PHPStan to commit 3b17acc5de4ac507d678f9ca9b2cd15937921ffb
• 6f5255b Updated PHPStan to commit 5cf5b9ba9049e455598a73357fcd7d03e62f6886
• b1eda69 Updated PHPStan to commit 2731791ff6b06038f4e8b91c36f2d3908b4f61e1
• 2fed470 Updated PHPStan to commit 855a4ab1a0d7951abca41c5bfc2b0528f994fd27
• 3b72167 Updated PHPStan to commit da80c2997844e7bfeb3fefea54d69d2b6a746e73
• 90cdfea Updated PHPStan to commit d92d6162dd865735609480eea89ca1219bf56ce9
• cbe5fd5 Updated PHPStan to commit 631563582c7dfbc274ea6d81c5494e277475b3a3
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #63.