fix(updater): include app target so updater artifacts are produced

`bundle.targets: "dmg"` alone made the DMG bundler run an embedded
`.app` build, but the updater post-processor at `crates/tauri-bundler/
src/bundle.rs:207-220` only walks the user-specified `package_types`
list and matches strictly on `PackageType::MacOsBundle` (= the "app"
target). Without "app" in targets, no `.app.tar.gz` / `.sig` ever
gets written under `bundle/macos/`, which is what tripped the v0.16.0
release job ("No files were found with the provided path").

Adding "app" to the array makes Tauri produce both the standalone
`.app` bundle (and its tar.gz + sig) and the DMG, satisfying the two
upload-artifact steps without other side effects.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: koki-develop

src-tauri/tauri.conf.json

@@ -16,7 +16,7 @@
   },
   "bundle": {
     "active": true,
-    "targets": "dmg",
+    "targets": ["app", "dmg"],
     "createUpdaterArtifacts": true,
     "externalBin": ["binaries/cork-cli"],
     "icon": ["icons/32x32.png", "icons/128x128.png", "icons/128x128@2x.png", "icons/icon.icns"],