chore: update Tauri dependencies to 2.3.1

Update @tauri-apps/api, @tauri-apps/cli, and tauri-build to version 2.3.1 for consistency across desktop client dependencies.

desktop-client/package.json

@@ -13,12 +13,12 @@
     "tauri:build:windows-x64:linux": "XWIN_ARCH=x86_64 tauri build --runner cargo-xwin --target x86_64-pc-windows-msvc --config src-tauri/tauri.windows.conf.json"
   },
   "dependencies": {
-    "@tauri-apps/api": "^2.3.0",
+    "@tauri-apps/api": "2.3.1",
     "react": "^18.3.1",
     "react-dom": "^18.3.1"
   },
   "devDependencies": {
-    "@tauri-apps/cli": "^2.3.1",
+    "@tauri-apps/cli": "2.3.1",
     "@types/react": "^18.3.20",
     "@types/react-dom": "^18.3.6",
     "@vitejs/plugin-react": "^4.3.4",

desktop-client/src-tauri/Cargo.toml

@@ -10,7 +10,7 @@ name = "nexavpn_desktop"
 crate-type = ["staticlib", "cdylib", "rlib"]
 
 [build-dependencies]
-tauri-build = { version = "2.0.2" }
+tauri-build = { version = "2.3.1" }
 
 [dependencies]
 base64 = "0.22"