chore(deps): update commitlint monorepo to v19

Author: renovate[bot]

package.json

@@ -49,8 +49,8 @@
     "source-map-support": "0.5.9"
   },
   "devDependencies": {
-    "@commitlint/cli": "12.1.4",
-    "@commitlint/config-conventional": "12.1.4",
+    "@commitlint/cli": "19.8.1",
+    "@commitlint/config-conventional": "19.8.1",
     "@sourcegraph/eslint-config": "^0.17.2",
     "@sourcegraph/prettierrc": "3.0.3",
     "@sourcegraph/tsconfig": "4.0.1",