Update phpstan/extension-installer requirement from ^1.4.2 to ^1.4.3

Updates the requirements on [phpstan/extension-installer](https://github.com/phpstan/extension-installer) to permit the latest version.
- [Release notes](https://github.com/phpstan/extension-installer/releases)
- [Commits](phpstan/extension-installer@1.4.2...1.4.3)

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

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

composer.json

@@ -43,7 +43,7 @@
     "require-dev": {
         "jangregor/phpstan-prophecy": "^1.0.2",
         "phpspec/prophecy-phpunit": "^2.2",
-        "phpstan/extension-installer": "^1.4.2",
+        "phpstan/extension-installer": "^1.4.3",
         "phpunit/phpunit": "^9.6.17",
         "squizlabs/php_codesniffer": "^3.10"
     },