chore(deps): update commitlint monorepo to v18

Author: renovate[bot]

package.json

@@ -116,8 +116,8 @@
     "last 1 Safari versions"
   ],
   "devDependencies": {
-    "@commitlint/cli": "^12.1.4",
-    "@commitlint/config-conventional": "^12.1.4",
+    "@commitlint/cli": "^18.6.1",
+    "@commitlint/config-conventional": "^18.6.1",
     "@sourcegraph/eslint-config": "^0.20.8",
     "@sourcegraph/prettierrc": "^3.0.3",
     "@sourcegraph/tsconfig": "^4.0.1",