[TASK] Prepare the 8.5.1 release (#478)

Author: oliverklee

CHANGELOG.md

@@ -15,6 +15,10 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 
 ### Fixed
 
+## 8.5.1
+
+### Fixed
+
 - Fix (regression) failure to parse at-rules with strict parsing (#456)
 
 ## 8.5.0

composer.json

@@ -44,7 +44,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "9.0.x-dev"
+            "dev-main": "9.0.x-dev"
         }
     },
     "scripts": {