Bump minimum php version to 8.2.0

PiperOrigin-RevId: 848154177

Author: Rachel Goldfinger

php/composer.json

@@ -6,7 +6,7 @@
   "homepage": "https://developers.google.com/protocol-buffers/",
   "license": "BSD-3-Clause",
   "require": {
-    "php": ">=8.1.0"
+    "php": ">=8.2.0"
   },
   "require-dev": {
     "phpunit/phpunit": ">=5.0.0 <8.5.27"