Update dependencies for php 8

composer.json

@@ -16,16 +16,16 @@
         }
     ],
     "require": {
-        "php": ">=5.4",
+        "php": ">=8.0",
         "ext-curl": "*",
         "ext-json": "*",
         "ext-mbstring": "*"
     },
     "require-dev": {
-        "phpunit/phpunit" : "^7.0",
-        "satooshi/php-coveralls": "~2.2",
-        "squizlabs/php_codesniffer": "~3.5",
-        "friendsofphp/php-cs-fixer": "~2.16"
+        "phpunit/phpunit" : "^9.5.5",
+        "php-coveralls/php-coveralls": "^2.5.2",
+        "squizlabs/php_codesniffer": "^3.6.2",
+        "friendsofphp/php-cs-fixer": "^3.7.0"
     },
     "autoload": {
         "psr-4": { "jards\\gcsjardsapiclient\\Swagger\\Client\\" : "lib/" }