chore(deps): update commitlint monorepo to v8

Author: renovate-bot

package-lock.json

@@ -50,8 +50,8 @@
     "git-url-parse": "^11.1.1"
   },
   "devDependencies": {
-    "@commitlint/cli": "7.6.0",
-    "@commitlint/config-conventional": "7.6.0",
+    "@commitlint/cli": "8.0.0",
+    "@commitlint/config-conventional": "8.0.0",
     "@sourcegraph/prettierrc": "3.0.1",
     "@sourcegraph/tsconfig": "4.0.0",
     "@sourcegraph/tslint-config": "12.3.1",