Update Yarn to v3.8.7

Author: renovate[bot]

package.json

@@ -17,7 +17,7 @@
     "type": "git",
     "url": "git+https://github.com/IntellectualSites/schematic.cloud.git"
   },
-  "packageManager": "yarn@3.6.2",
+  "packageManager": "yarn@3.8.7",
   "type": "module",
   "author": "IntellectualSites",
   "bugs": {