ci: fix "Update Prettier" workflow (#22)

Author: wolfy1339

.github/workflows/update-prettier.yml

@@ -2,7 +2,7 @@ name: Update Prettier
 on:
   push:
     branches:
-      - "dependabot/npm_and_yarn/prettier-*"
+      - "renovate/prettier-*"
   workflow_dispatch: {}
 jobs:
   update_prettier:

package.json

@@ -35,7 +35,7 @@
     "@types/node": "^14.14.32",
     "fetch-mock": "^9.11.0",
     "jest": "^27.0.0",
-    "prettier": "^2.2.1",
+    "prettier": "2.3.0",
     "semantic-release": "^17.4.1",
     "semantic-release-plugin-update-version-in-files": "^1.1.0",
     "ts-jest": "^27.0.0-next.12",