Update phpstan/phpstan requirement from ^1.5.3 to ^1.6.3

[dependabot[bot]]

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

Release notes

Sourced from phpstan/phpstan's releases.

1.6.3

Improvements 🔧

• Handle ConstantArrayType === ConstantArrayType (https://github.com/phpstan/phpstan-src/commit/6e02453df3b991d3c17fb54dbfafc9e6c8d1e7a0)
• Handle ConstantArrayType == ConstantArrayType (https://github.com/phpstan/phpstan-src/commit/c9ae89cab4ea23b0c867fd5162bd5b3022331aa3)
• Understand == between ConstantScalarType (https://github.com/phpstan/phpstan-src/commit/5c85200c977101a57a3910f1c10b872093fe5b47)
• Use root expression when checking impossible types (#1254), thanks @​herndlm!
• implemented str_contains FunctionTypeSpecifyingExtension (#1068), thanks @​staabm!

Bleeding edge 🔪

• ConstantLooseComparisonRule - level 4 (https://github.com/phpstan/phpstan-src/commit/6ebf2361a3c831dd105a815521889428c295dc9f)

If you want to see the shape of things to come and adopt bleeding edge features early, you can include this config file in your project's phpstan.neon:

includes:
    - vendor/phpstan/phpstan/conf/bleedingEdge.neon

Of course, there are no backwards compatibility guarantees when you include this file. The behaviour and reported errors can change in minor versions with this file included. Learn more

Bugfixes 🐛

• Fix first-class callable internal error (https://github.com/phpstan/phpstan-src/commit/3f75d8ac0c43650a77b0774810cb79802db016aa), #7135

Commits

• 6128620 PHPStan 1.6.3
• fae532c Update Nextras ORM baseline
• d3ee38b Update Composer baseline
• 348d07a Updated PHPStan to commit 6ebf2361a3c831dd105a815521889428c295dc9f
• aaf5cd7 Updated PHPStan to commit 49b8b263504e016c9dfaabf1b3b14d5dad34fa4a
• 4c90bbc Updated PHPStan to commit 7e1e51d91f6dbdfe7d001ea2db6cb6232411effe
• 60baf70 Updated PHPStan to commit 5c85200c977101a57a3910f1c10b872093fe5b47
• 40abd99 Updated PHPStan to commit 6bf335ca92338db247f8979b4a1a80cb6edae227
• 8f53188 Updated PHPStan to commit c9ae89cab4ea23b0c867fd5162bd5b3022331aa3
• 3d7ced6 Updated PHPStan to commit 6e02453df3b991d3c17fb54dbfafc9e6c8d1e7a0
• Additional commits viewable in compare view

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Dependabot will merge this PR once it's up-to-date and CI passes on it, as requested by @tarampampam.

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