Bump the min PHP version to 8.1

This matches the PHP requirement of Symfony 6.4 LTS which will be the
new minimum version.

Author: stof

.github/workflows/ci.yaml

@@ -15,15 +15,13 @@ jobs:
             fail-fast: false
             matrix:
                 php:
-                    - '7.4'
-                    - '8.0'
                     - '8.1'
                     - '8.2'
                     - '8.3'
                 symfony-versions: [false]
                 include:
                     -   description: 'Symfony 4.*'
-                        php: '7.4'
+                        php: '8.1'
                         symfony-versions: '^4.4'
                     -   description: 'Symfony 5.*'
                         php: '8.1'

composer.json

@@ -21,7 +21,7 @@
         }
     ],
     "require": {
-        "php": "^7.4 || ^8.0",
+        "php": "^8.1",
         "ext-dom": "*",
         "ext-json": "*",
         "symfony/config": "^4.4 || ^5.0 || ^6.0 || ^7.0",

tests/Util/CanonicalizerTest.php

@@ -33,7 +33,7 @@ public function canonicalizeProvider()
         return [
             [null, null],
             ['FOO', 'foo'],
-            [chr(171), PHP_VERSION_ID < 50600 ? chr(171) : '?'],
+            [chr(171), '?'],
         ];
     }
 }