fix: correct dependency version

Author: Wesley-Young

package.json

@@ -1,7 +1,7 @@
 {
   "name": "stdhub-plugin-api",
   "type": "module",
-  "version": "0.5.0",
+  "version": "0.5.1",
   "description": "Server-side API for stdhub plugins.",
   "main": "src/index.ts",
   "scripts": {},
@@ -17,7 +17,7 @@
   },
   "devDependencies": {
     "@eslint/js": "^8.56.0",
-    "@minecraft/server": "1.14.0-beta.1.21.20-preview.21",
+    "@minecraft/server": "1.12.0-beta.1.21.1-stable",
     "@types/express": "^4.17.21",
     "@types/node": "^20.14.7",
     "eslint": "^8.56.0",