chore(legacy): bump terser peer dep to ^5.16 (#18772)

Author: sapphi-red

packages/plugin-legacy/package.json

@@ -52,7 +52,7 @@
     "systemjs": "^6.15.1"
   },
   "peerDependencies": {
-    "terser": "^5.4.0",
+    "terser": "^5.16.0",
     "vite": "^6.0.0"
   },
   "devDependencies": {