feat: add Zod v4 peer dependency support

Widen zod peer dependency from ^3.20.0 to ^3.20.0 || ^4.0.0.
The runtime API (ZodType, ZodError, safeParse) is compatible
across both major versions.

Author: rutbergphilip

package.json

@@ -1,6 +1,6 @@
 {
   "name": "nuxt-safe-action",
-  "version": "0.3.0",
+  "version": "0.4.0",
   "description": "Type-safe and validated server actions for Nuxt",
   "repository": {
     "type": "git",
@@ -80,7 +80,7 @@
     "zod": "^3.24.0"
   },
   "peerDependencies": {
-    "zod": "^3.20.0"
+    "zod": "^3.20.0 || ^4.0.0"
   },
   "peerDependenciesMeta": {
     "zod": {