Set up main branch to become 6.0 in the future

Author: mnocon

composer.json

@@ -17,10 +17,10 @@
         "php": " >=8.3",
         "ext-dom": "*",
         "erusev/parsedown": "^1.7",
-        "ibexa/admin-ui": "~5.0.x-dev",
-        "ibexa/core": "~5.0.x-dev",
-        "ibexa/fieldtype-richtext": "~5.0.x-dev",
-        "ibexa/rest": "~5.0.x-dev",
+        "ibexa/admin-ui": "~6.0.x-dev",
+        "ibexa/core": "~6.0.x-dev",
+        "ibexa/fieldtype-richtext": "~6.0.x-dev",
+        "ibexa/rest": "~6.0.x-dev",
         "lexik/jwt-authentication-bundle": "^2.8",
         "overblog/graphql-bundle": "^1.6.0",
         "symfony/config": "^7.4",
@@ -34,15 +34,15 @@
     },
     "require-dev": {
         "ibexa/code-style": "~2.0.0",
-        "ibexa/content-forms": "~5.0.x-dev",
-        "ibexa/design-engine": "~5.0.x-dev",
-        "ibexa/doctrine-schema": "~5.0.x-dev",
-        "ibexa/http-cache": "~5.0.x-dev",
-        "ibexa/notifications": "~5.0.x-dev",
-        "ibexa/rector": "~5.0.x-dev",
-        "ibexa/search": "~5.0.x-dev",
-        "ibexa/twig-components": "~5.0.x-dev",
-        "ibexa/user": "~5.0.x-dev",
+        "ibexa/content-forms": "~6.0.x-dev",
+        "ibexa/design-engine": "~6.0.x-dev",
+        "ibexa/doctrine-schema": "~6.0.x-dev",
+        "ibexa/http-cache": "~6.0.x-dev",
+        "ibexa/notifications": "~6.0.x-dev",
+        "ibexa/rector": "~6.0.x-dev",
+        "ibexa/search": "~6.0.x-dev",
+        "ibexa/twig-components": "~6.0.x-dev",
+        "ibexa/user": "~6.0.x-dev",
         "mikey179/vfsstream": "^1.6",
         "overblog/graphiql-bundle": "^1.0",
         "phpspec/phpspec": "^7.1 || ^8.0",
@@ -69,7 +69,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-main": "5.0.x-dev"
+            "dev-main": "6.0.x-dev"
         }
     },
     "config": {