chore: Update commitlint monorepo to v20

Author: renovate[bot]

package.json

@@ -45,9 +45,9 @@
   },
   "devDependencies": {
     "@backstage/cli": "^0.34.1",
-    "@commitlint/cli": "^19.0.0",
-    "@commitlint/config-conventional": "^19.0.0",
-    "@commitlint/config-lerna-scopes": "^19.0.0",
+    "@commitlint/cli": "^20.0.0",
+    "@commitlint/config-conventional": "^20.0.0",
+    "@commitlint/config-lerna-scopes": "^20.0.0",
     "@spotify/prettier-config": "^15.0.0",
     "@trivago/prettier-plugin-sort-imports": "^4.2.1",
     "@typescript-eslint/parser": "^7.0.0",