chore(deps): update commitlint monorepo to v20

Author: renovate[bot]

package.json

@@ -41,8 +41,8 @@
   },
   "homepage": "https://github.com/pact-foundation/jest-pact/#readme",
   "devDependencies": {
-    "@commitlint/cli": "^19.0.0",
-    "@commitlint/config-conventional": "^19.2.2",
+    "@commitlint/cli": "^20.0.0",
+    "@commitlint/config-conventional": "^20.0.0",
     "@pact-foundation/pact": "^16.0.0",
     "@pact-foundation/pact-js-prettier-config": "^1.0.0",
     "@tsconfig/node14": "^14.0.0",