Build(deps-dev): Bump phpstan/extension-installer from 1.0.3 to 1.0.4

Bumps [phpstan/extension-installer](https://github.com/phpstan/extension-installer) from 1.0.3 to 1.0.4.
- [Release notes](https://github.com/phpstan/extension-installer/releases)
- [Commits](phpstan/extension-installer@1.0.3...1.0.4)

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

composer.json

@@ -22,7 +22,7 @@
     "ergebnis/test-util": "~1.0.0",
     "infection/infection": "~0.13.6",
     "jangregor/phpstan-prophecy": "~0.6.2",
-    "phpstan/extension-installer": "^1.0.3",
+    "phpstan/extension-installer": "^1.0.4",
     "phpstan/phpstan": "~0.12.18",
     "phpstan/phpstan-deprecation-rules": "~0.12.2",
     "phpstan/phpstan-phpunit": "~0.12.6",