chore(deps): update commitlint monorepo to v9

Author: renovate-bot

package.json

@@ -47,8 +47,8 @@
     "sourcegraph": ">=24.5.0"
   },
   "devDependencies": {
-    "@commitlint/cli": "^8.3.5",
-    "@commitlint/config-conventional": "^8.3.4",
+    "@commitlint/cli": "^9.0.1",
+    "@commitlint/config-conventional": "^9.0.1",
     "@sourcegraph/prettierrc": "^2.2.0",
     "@sourcegraph/tsconfig": "^4.0.1",
     "@sourcegraph/tslint-config": "^13.4.0",