Allow Symfony ^8.0

Author: nicolas-grekas

composer.json

@@ -23,12 +23,12 @@
         "symfony/polyfill-mbstring": "~1.0"
     },
     "require-dev": {
-        "symfony/error-handler": "^6.4|^7.0",
-        "symfony/emoji": "^7.1",
-        "symfony/http-client": "^6.4|^7.0",
-        "symfony/intl": "^6.4|^7.0",
+        "symfony/error-handler": "^6.4|^7.0|^8.0",
+        "symfony/emoji": "^7.1|^8.0",
+        "symfony/http-client": "^6.4|^7.0|^8.0",
+        "symfony/intl": "^6.4|^7.0|^8.0",
         "symfony/translation-contracts": "^2.5|^3.0",
-        "symfony/var-exporter": "^6.4|^7.0"
+        "symfony/var-exporter": "^6.4|^7.0|^8.0"
     },
     "conflict": {
         "symfony/translation-contracts": "<2.5"