build(deps-dev): update phpstan/phpstan requirement from ^1.6 to ^1.7

Updates the requirements on [phpstan/phpstan](https://github.com/phpstan/phpstan) to permit the latest version.
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Changelog](https://github.com/phpstan/phpstan/blob/1.7.x/CHANGELOG.md)
- [Commits](phpstan/phpstan@1.6.0...1.7.0)

---
updated-dependencies:
- dependency-name: phpstan/phpstan
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Diff for: composer.json

@@ -22,7 +22,7 @@
         "ergebnis/composer-normalize": "^2.26",
         "infection/infection": "^0.25",
         "phpstan/extension-installer": "^1.1",
-        "phpstan/phpstan": "^1.6",
+        "phpstan/phpstan": "^1.7",
         "phpstan/phpstan-phpunit": "^1",
         "phpunit/phpunit": "^9.5",
         "spatie/phpunit-snapshot-assertions": "^4.2",