Bump phpstan/phpstan from 0.10.7 to 0.10.8

Bumps [phpstan/phpstan](https://github.com/phpstan/phpstan) from 0.10.7 to 0.10.8.
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Commits](phpstan/phpstan@0.10.7...0.10.8)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

composer.json

@@ -24,7 +24,7 @@
         "phpdocumentor/reflection-docblock": "^4",
         "phpdocumentor/type-resolver": "0.5.0 as 0.4.0",
         "phpstan/phpdoc-parser": "^0.3",
-        "phpstan/phpstan": "0.10.7",
+        "phpstan/phpstan": "0.10.8",
         "phpstan/phpstan-beberlei-assert": "0.10",
         "phpstan/phpstan-doctrine": "0.10",
         "phpstan/phpstan-mockery": "0.10.2",