drop EOL php versions

Author: shu-yusa

composer.json

@@ -7,7 +7,8 @@
   "license": "Apache-2.0",
   "version": "1.57.0",
   "require": {
-    "php": ">=7.0.0"
+    "php": "^8.1.0",
+    "ext-grpc": "*"
   },
   "suggest": {
     "ext-protobuf": "For better performance, install the protobuf C extension.",