Update dependency @pattern-lab/engine-handlebars to v6

Author: renovate[bot]

package-lock.json

@@ -52,7 +52,7 @@
   "dependencies": {
     "@pattern-lab/cli": "^5.15.0",
     "@pattern-lab/core": "^5.15.0",
-    "@pattern-lab/engine-handlebars": "^5.14.3",
+    "@pattern-lab/engine-handlebars": "^6.0.0",
     "@pattern-lab/starterkit-handlebars-vanilla": "^1.4.2",
     "@pattern-lab/uikit-workshop": "^5.15.0"
   },