Update dependency prettier to v2.8.6

Author: renovate[bot]

package-lock.json

@@ -63,7 +63,7 @@
     "jest": "27.5.1",
     "mkdirp": "2.1.6",
     "np": "7.6.4",
-    "prettier": "2.8.5",
+    "prettier": "2.8.6",
     "rimraf": "4.4.1",
     "ts-jest": "27.1.5",
     "typescript": "4.7.4",