chore(deps): update commitlint monorepo to v20

Author: renovate[bot]

package.json

@@ -47,8 +47,8 @@
     "require": "ts-node/register"
   },
   "devDependencies": {
-    "@commitlint/cli": "^17.6.7",
-    "@commitlint/config-conventional": "^17.6.7",
+    "@commitlint/cli": "^20.1.0",
+    "@commitlint/config-conventional": "^20.0.0",
     "@sourcegraph/eslint-config": "^0.23.0",
     "@sourcegraph/prettierrc": "^3.0.3",
     "@sourcegraph/tsconfig": "^4.0.1",