build: utiliser phpunit 10

composer.json

 {
     "name": "spip/tests",
-    "type": "library",
     "description": "Test suite for SPIP.",
-    "keywords": ["cms", "spip"],
     "license": [
         "MIT"
     ],
+    "type": "library",
+    "keywords": [
+        "cms",
+        "spip"
+    ],
+    "require": {
+        "php": ">=8.1.0",
+        "ext-ctype": "*",
+        "ext-json": "*"
+    },
+    "require-dev": {
+        "lolli42/finediff": "^1.0",
+        "phpunit/phpunit": "^10.0",
+        "symfony/var-dumper": "^6.2",
+        "symplify/easy-coding-standard": "^11.1"
+    },
+    "suggest": {
+        "ext-iconv": "Can be used as fallback when ext-mbstring is not available",
+        "ext-mbstring": "For best performance, mbstring should be installed as it is faster than ext-iconv"
+    },
+    "repositories": [],
     "autoload": {
         "psr-4": {
             "Spip\\Core\\Testing\\": "src/"
@@ -18,24 +37,10 @@
             "Utils\\Rector\\Tests\\": "utils/rector/tests"
         }
     },
-    "require": {
-        "php": ">=7.4.0",
-        "ext-json": "*",
-        "ext-ctype": "*"
-    },
-    "suggest": {
-        "ext-mbstring": "For best performance, mbstring should be installed as it is faster than ext-iconv",
-        "ext-iconv": "Can be used as fallback when ext-mbstring is not available"
-    },
-    "require-dev": {
-        "lolli42/finediff": "^1.0",
-        "phpunit/phpunit": "^8.3 || ^9.4",
-        "symfony/var-dumper": "^5.4 || ^6",
-        "symplify/easy-coding-standard": "^11.1"
-    },
-    "repositories": [
-    ],
     "config": {
+        "platform": {
+            "php": "8.1.17"
+        },
         "sort-packages": true
     }
 }

phpunit.xml.dist

 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit bootstrap="./tests/bootstrap.php"
-         colors="true"
-         convertErrorsToExceptions="true"
-         convertNoticesToExceptions="true"
-         convertWarningsToExceptions="true"
-         stopOnFailure="false">
+<phpunit
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    bootstrap="./tests/bootstrap.php"
+    colors="true"
+    stopOnFailure="false"
+    xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.0/phpunit.xsd"
+    cacheDirectory=".phpunit.cache"
+>
+  <coverage/>
 	<testsuites>
 		<testsuite name="core"><directory>./tests/</directory></testsuite>
  	</testsuites>