chore: sync version to 4.42.1 after release

- Update package.json to match published npm version
- Update installer package.json to match

package.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://json.schemastore.org/package.json",
   "name": "bmad-method",
-  "version": "4.42.0",
+  "version": "4.42.1",
   "description": "Breakthrough Method of Agile AI-driven Development",
   "keywords": [
     "agile",