Update GitHub Actions to use latest macOS and Xcode versions

- Update macOS build job to use macos-latest and Xcode 26.0.1 (matching iOS/tvOS)
- Update bump-build workflow to use latest action versions (checkout@v4, create-pull-request@v7)
- Add cache-version to ruby/setup-ruby for consistency

.github/workflows/release.yml

@@ -52,7 +52,7 @@ jobs:
           if-no-files-found: ignore
   mac_notarized:
     name: Build and notarize macOS app
-    runs-on: macos-15
+    runs-on: macos-latest
     steps:
       - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
@@ -66,7 +66,7 @@ jobs:
           sed -i '' 's/3rd Party Mac Developer Application/Developer ID Application/' Yattee.xcodeproj/project.pbxproj
       - uses: maxim-lobanov/setup-xcode@v1
         with:
-          xcode-version: '16.4'
+          xcode-version: '26.0.1'
       - uses: maierj/fastlane-action@v3.0.0
         with:
           lane: mac build_and_notarize