chore(deps): pin dependency prettier to 2.8.7 (#595)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package-lock.json

@@ -41,7 +41,7 @@
     "get-stream": "6.0.1",
     "got": "12.6.0",
     "p-retry": "5.1.2",
-    "prettier": "^2.8.2",
+    "prettier": "2.8.7",
     "semantic-release": "20.1.3",
     "sinon": "15.0.2",
     "stream-buffers": "3.0.2"