Bump prettier from 2.7.1 to 2.8.7

Bumps [prettier](https://github.com/prettier/prettier) from 2.7.1 to 2.8.7.
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/main/CHANGELOG.md)
- [Commits](https://github.com/prettier/prettier/compare/2.7.1...2.8.7)

---
updated-dependencies:
- dependency-name: prettier
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -54,7 +54,7 @@
     "esm": "^3.2.25",
     "mocha": "^8.4.0",
     "npm-run-all": "^4.1.5",
-    "prettier": "2.7.1",
+    "prettier": "2.8.7",
     "webpack": "^5.76.1",
     "webpack-cli": "^4.10.0"
   },