Remove unused dependency

Author: Mrtenz

packages/snaps-controllers/package.json

@@ -134,7 +134,6 @@
     "jest": "^29.0.2",
     "jest-fetch-mock": "^3.0.3",
     "jest-silent-reporter": "^0.6.0",
-    "mkdirp": "^1.0.4",
     "prettier": "^3.3.3",
     "rimraf": "^4.1.2",
     "ts-node": "^10.9.1",

yarn.lock

@@ -4255,7 +4255,6 @@ __metadata:
     jest-fetch-mock: "npm:^3.0.3"
     jest-silent-reporter: "npm:^0.6.0"
     luxon: "npm:^3.5.0"
-    mkdirp: "npm:^1.0.4"
     nanoid: "npm:^3.3.10"
     prettier: "npm:^3.3.3"
     readable-stream: "npm:^3.6.2"