fix(php): add PHPStan for static code analysis (generated)

algolia/api-clients-automation#3655

Co-authored-by: algolia-bot <accounts+algolia-api-client-bot@algolia.com>
Co-authored-by: Pierre Millot <pierre.millot@algolia.com>
Co-authored-by: shortcuts <vannicattec@gmail.com>

package.json

@@ -31,7 +31,6 @@
     "bundlesize": "0.18.2",
     "execa": "9.3.1",
     "lerna": "8.1.8",
-    "nx": "19.6.4",
     "rollup": "4.21.2",
     "rollup-plugin-node-globals": "1.4.0",
     "rollup-plugin-typescript2": "0.36.0",