ci: use macOS 26 runner

Author: brucehsu

.github/workflows/release-desktop.yml .github/workflows/desktop-release.yml.github/workflows/release-desktop.yml renamed to .github/workflows/desktop-release.yml

@@ -30,11 +30,11 @@ jobs:
             target: x86_64-unknown-linux-gnu
             bundle_name: Linux x64
             platform: linux
-          - runner: macos-15
+          - runner: macos-26
             target: aarch64-apple-darwin
             bundle_name: Apple Silicon
             platform: macos
-          - runner: macos-15-intel
+          - runner: macos-26-intel
             target: x86_64-apple-darwin
             bundle_name: Intel
             platform: macos