Fix: Remove portable target to fix SHA512 checksum mismatch

The portable and nsis targets both produced x64.exe files with the same
name, causing one to overwrite the other. The latest.yml contained the
checksum from one build while the actual file was from the other build.

Removed portable target - nsis installer is sufficient.
Bump version to 2.0.11

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "hytale-f2p-launcher",
-  "version": "2.0.10",
+  "version": "2.0.11",
   "description": "A modern, cross-platform launcher for Hytale with automatic updates and multi-client support",
   "homepage": "https://github.com/amiayweb/Hytale-F2P",
   "main": "main.js",
@@ -77,12 +77,6 @@
             "x64",
             "arm64"
           ]
-        },
-        {
-          "target": "portable",
-          "arch": [
-            "x64"
-          ]
         }
       ],
       "icon": "icon.ico"