chore: bump minimum PHP version to 8.1

Author: evansims

README.md

@@ -17,7 +17,7 @@ This is largely intended for inclusion in libraries like SDKs that wish to suppo
 
 ## Requirements
 
--   PHP 8.0+
+-   PHP 8.1+
 -   Composer 2.0+
 
 Successful discovery requires the presence of a compatible implementation in the host application. This library does not install any implementations for you.

composer.json

@@ -17,7 +17,7 @@
     ],
     "homepage": "https://github.com/psr-discovery/http-client-implementations",
     "require": {
-        "php": "^8.0",
+        "php": "^8.1",
         "psr/container": "^1.0 | ^2.0",
         "psr-discovery/discovery": "^1.0"
     },