Update dependency prettier to v2.8.7

Author: renovate[bot]

package.json

@@ -84,7 +84,7 @@
     "mocha": "9.2.2",
     "nyc": "15.1.0",
     "opn-cli": "5.0.0",
-    "prettier": "2.6.1",
+    "prettier": "2.8.7",
     "pretty-quick": "3.1.3",
     "release-it": "14.13.1",
     "semantic-release": "19.0.2",