Update phpstan/phpstan requirement from ^1.6 to ^1.7

[dependabot[bot]]

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

Release notes

Sourced from phpstan/phpstan's releases.

1.7.8

Improvements 🔧

• Update nikic/php-parser to 4.14.0 (https://github.com/phpstan/phpstan-src/commit/fbaab8f9a65fb0655b0322c792d914feb399e27e)

Bugfixes 🐛

• Improve unresolved template type checks for complex conditional types (#1377), thanks @​rvanvelzen!
• FileCacheStorage - suppress potential file load issue (https://github.com/phpstan/phpstan-src/commit/b73a3962176ddcb6c3ddcd1e6f688900ebe9df1f)
• Do not overwrite promoted property PHPDoc with constructor PHPDoc (#1376), #7361, thanks @​herndlm!
• Fix/native type specification (#1372), thanks @​rajyan!

Function signature fixes 🤖

• Fix signatures of PDO::pgsqlCopy{From,To}{Array,File} (#1375), thanks @​takaram!

Commits

• 2bf3d43 PHPStan 1.7.8
• 7854d2a Updated PHPStan to commit 5719046fd1def97752e657137611aeb3d26ec6d0
• 9c976b8 Updated PHPStan to commit 981f5493f16c959fbf46dd16a95259ffc1b8a89e
• d6c3fa4 Updated PHPStan to commit 13d4bcec556ae243b0b5ecaa3924eff7060dbb8a
• d73f2c5 Updated PHPStan to commit b73a3962176ddcb6c3ddcd1e6f688900ebe9df1f
• 88d3806 Github Actions - use GitHub cache for Docker images
• a7ae2a6 Updated PHPStan to commit e1fd5d232025efb349cc68b7b53365be496f4bcc
• cadad14 PHPStan 1.7.7
• 2b601a4 Updated PHPStan to commit 75c5574a402e858458bf0f83a5942a22e6cfb737
• 7457f7b Updated PHPStan to commit 3d2a3d797604c0d4eb95a799392a9f04194e0f81
• Additional commits viewable in compare view

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[coveralls]

Coverage remained the same at 100.0% when pulling f6fcee89f3374887e220c8968f6efc9f96bf2d45 on dependabot/composer/phpstan/phpstan-tw-1.7 into 33ea3ab48b42e7a2cf414feb1d030762e5dae6e5 on master.