Roll back and pin Biome to v2.3.9.

See: biomejs/biome#8635

Author: lgarron

bun.lock

@@ -32,7 +32,7 @@
     "printable-shell-command": ">=4.0.3"
   },
   "devDependencies": {
-    "@biomejs/biome": "^2.3.10",
+    "@biomejs/biome": "2.3.9",
     "@schemastore/package": "^0.0.10",
     "@types/bun": "^1.3.5",
     "@types/node": "^25.0.3",