chore: update commitlint monorepo to v18

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -46,10 +46,10 @@
     "strong-globalize": "^6.0.0"
   },
   "devDependencies": {
-    "@commitlint/config-conventional": "^13.1.0",
+    "@commitlint/config-conventional": "^18.6.1",
     "benchmark": "^2.1.4",
     "bluebird": "^3.5.4",
-    "commitlint": "^13.1.0",
+    "commitlint": "^18.6.1",
     "coveralls": "^3.0.4",
     "eslint": "^6.6.0",
     "eslint-config-loopback": "^13.0.0",