ci(release): pin macOS runner to macos-26

.github/workflows/release.yml

@@ -85,7 +85,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: macos-latest
+          - os: macos-26
             args: "--target universal-apple-darwin --config src-tauri/tauri.release.conf.json"
             rust-targets: "aarch64-apple-darwin,x86_64-apple-darwin"
           - os: ubuntu-latest