Remove support for PHP 8.0

Signed-off-by: George Steel <[email protected]>

composer.json

@@ -23,7 +23,7 @@
     "config": {
         "sort-packages": true,
         "platform": {
-            "php": "8.0.99"
+            "php": "8.1.99"
         },
         "allow-plugins": {
             "dealerdirect/phpcodesniffer-composer-installer": true
@@ -35,7 +35,7 @@
         }
     },
     "require": {
-        "php": "~8.0.0 || ~8.1.0 || ~8.2.0",
+        "php": "~8.1.0 || ~8.2.0",
         "mezzio/mezzio-helpers": "^5.0",
         "mezzio/mezzio-router": "^3.7",
         "mezzio/mezzio-template": "^2.0",
@@ -44,7 +44,7 @@
     },
     "require-dev": {
         "laminas/laminas-coding-standard": "~2.5.0",
-        "phpunit/phpunit": "^9.5.26"
+        "phpunit/phpunit": "^9.6.7"
     },
     "conflict": {
         "container-interop/container-interop": "<1.2.0",