chore(deps): update commitlint monorepo to v18

Author: renovate[bot]

package.json

@@ -122,8 +122,8 @@
     "last 1 Safari versions"
   ],
   "devDependencies": {
-    "@commitlint/cli": "^17.3.0",
-    "@commitlint/config-conventional": "^17.3.0",
+    "@commitlint/cli": "^18.6.1",
+    "@commitlint/config-conventional": "^18.6.1",
     "@sourcegraph/prettierrc": "^2.2.0",
     "@sourcegraph/tsconfig": "^4.0.1",
     "@sourcegraph/tslint-config": "^13.4.0",