Upgrade framework

vendor/sebastian/diff/composer.json

@@ -1,7 +1,7 @@
 {
     "name": "sebastian/diff",
     "description": "Diff implementation",
-    "keywords": ["diff"],
+    "keywords": ["diff", "udiff", "unidiff", "unified diff"],
     "homepage": "https://github.com/sebastianbergmann/diff",
     "license": "BSD-3-Clause",
     "authors": [
@@ -14,20 +14,34 @@
             "email": "mail@kore-nordmann.de"
         }
     ],
+    "prefer-stable": true,
+    "config": {
+        "platform": {
+            "php": "7.3.0"
+        },
+        "optimize-autoloader": true,
+        "sort-packages": true
+    },
     "require": {
-        "php": "^5.3.3 || ^7.0"
+        "php": ">=7.3"
     },
     "require-dev": {
-        "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.0"
+        "phpunit/phpunit": "^9.3",
+        "symfony/process": "^4.2 || ^5"
     },
     "autoload": {
         "classmap": [
             "src/"
         ]
     },
+    "autoload-dev": {
+        "classmap": [
+            "tests/"
+        ]
+    },
     "extra": {
         "branch-alias": {
-            "dev-master": "1.4-dev"
+            "dev-master": "4.0-dev"
         }
     }
 }