Upgrade to Yarn v4 and add outdated plugin

Author: joephela

.yarn/plugins/@yarnpkg/plugin-outdated.cjs

@@ -1,7 +1,12 @@
+compressionLevel: mixed
+
+enableGlobalCache: false
+
 nodeLinker: node-modules
 
 plugins:
-  - path: .yarn/plugins/@yarnpkg/plugin-outdated.cjs
-    spec: "https://mskelton.dev/yarn-outdated/v3"
+  - checksum: c13ed363e15a826d9f779e7e7aca9dbee1d6d54813261d6f495da2fa94b01fa7579e516587ae2df5834f5d63d5d90cb392135190e8878b81dbd830c3c9f57809
+    path: .yarn/plugins/@yarnpkg/plugin-outdated.cjs
+    spec: "https://go.mskelton.dev/yarn-outdated/v4"
 
-yarnPath: .yarn/releases/yarn-3.6.4.cjs
+yarnPath: .yarn/releases/yarn-4.6.0.cjs

.yarn/releases/yarn-3.6.4.cjs

@@ -4,7 +4,7 @@
   "private": true,
   "author": "Widen",
   "license": "ISC",
-  "packageManager": "yarn@3.6.4",
+  "packageManager": "yarn@4.6.0",
   "repository": "github:Widen/eslint-config",
   "workspaces": [
     "packages/*"