chore(deps): update yarn to v4

Author: renovate[bot]

.yarn/releases/yarn-3.3.1.cjs

@@ -1,3 +1,3 @@
 nodeLinker: node-modules
 
-yarnPath: .yarn/releases/yarn-3.3.1.cjs
+yarnPath: .yarn/releases/yarn-4.3.0.cjs

.yarnrc.yml

@@ -20,5 +20,5 @@
     "build": "vuepress build docs",
     "blog": "./scripts/create-blog.js"
   },
-  "packageManager": "yarn@3.3.1"
+  "packageManager": "yarn@4.3.0"
 }