Allow using psr/cache 2.0 (#667)

Since version 1.7.2, php-http/cache-plugin can work with psr/cache 2.0
(this was the only difference in their changelog). Here, we allow both versions
to remain compatible with PHP 7

Author: mattjmattj

composer.json

@@ -25,12 +25,12 @@
         "php": "^7.2.5 || ^8.0",
         "ext-json": "*",
         "ext-xml": "*",
-        "php-http/cache-plugin": "^1.7.1",
+        "php-http/cache-plugin": "^1.7.2",
         "php-http/client-common": "^2.3",
         "php-http/discovery": "^1.12",
         "php-http/httplug": "^2.2",
         "php-http/multipart-stream-builder": "^1.1.2",
-        "psr/cache": "^1.0",
+        "psr/cache": "^1.0 || ^2.0",
         "psr/http-client-implementation": "^1.0",
         "psr/http-factory-implementation": "^1.0",
         "psr/http-message": "^1.0",