Update phpstan/phpstan requirement from ^0.12.32 to ^1.5.4

[dependabot[bot]]

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

Release notes

Sourced from phpstan/phpstan's releases.

1.5.4

Bugfixes 🐛

• Support named arguments when resolving template parameters (#1151), #5262, thanks @​rvanvelzen!
• Various fixes for constant arrays (#1154), #4308, #6965, #6961, #6383, #5933, #5382, #6379, #3284
• Fix for arrays not being accepted when having an accessory type (https://github.com/phpstan/phpstan-src/commit/843ebbb1d889ac4d9a152a52f1f1ee9690d2e721), #6552
• Avoid describing ConstantArrayType values twice (#1168, #1169), thanks @​herndlm!
• Fix false positive UnhandledMatchError throw point (#1165), #6910, thanks @​rajyan!
• Fix in_array() bug (https://github.com/phpstan/phpstan-src/commit/0ae28f761b2e0d473224aded78960d3d96b4e31e)
• Various optimization attempts (https://github.com/phpstan/phpstan-src/commit/91c7507787b4a9a63568562cda35644f139460c2, https://github.com/phpstan/phpstan-src/commit/5400b5858ef1750ede656dffc894acbbbc228e88, https://github.com/phpstan/phpstan-src/commit/c4c64fe6dae985d196aea92f3b7eca40e70c7ef4)

Function signature fixes 🤖

• added show_source() signature, an alias of highlight_file() (#1160), thanks @​staabm!
• more precise getenv() signature (#1161), thanks @​staabm!

Commits

• bbf68ca PHPStan 1.5.4
• 95d5375 Updated PHPStan to commit c4c64fe6dae985d196aea92f3b7eca40e70c7ef4
• e5577a3 Updated PHPStan to commit f3b2926d0cb4b652e742251bbf06d1b81c9055a4
• 7e81ebd Update test-projects.yml
• 8c6f5f4 Updated PHPStan to commit 0ae28f761b2e0d473224aded78960d3d96b4e31e
• 1fd7f1b Updated PHPStan to commit 5400b5858ef1750ede656dffc894acbbbc228e88
• 2aba239 Updated PHPStan to commit 2c9273e76ae1479850c290b89bfa0f414c088a26
• 60697cc Update baselines
• 6bf6918 Updated PHPStan to commit 6b6f31090ac25368a5a419b38e46eb074e08fdbd
• 19d9a77 Updated PHPStan to commit ded3d217fb232b6f954c6fab9d4070d9ccf872e3
• Additional commits viewable in compare view

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Superseded by #250.