chore(deps): update dependency prettier to ^2.8.7

Author: renovate[bot]

package.json

@@ -131,7 +131,7 @@
     "mocha": "^7.2.0",
     "nyc": "^13.3.0",
     "parcel-bundler": "^1.12.4",
-    "prettier": "^2.2.1",
+    "prettier": "^2.8.7",
     "sinon": "^9.2.2",
     "source-map-support": "^0.5.19",
     "sourcegraph": "^25.3.0",