Try macos-26 runner to avoid dyld framework issues (v0.0.13)

macos-15 has dyld missing symbol issues with CoreMedia framework.
macos-26 (public preview) should have fixes and Icon Composer support.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: hi2gage

.github/workflows/release.yml

@@ -10,7 +10,7 @@ permissions:
 
 jobs:
   build-and-release:
-    runs-on: macos-15
+    runs-on: macos-26
 
     env:
       KEYCHAIN_PASSWORD: ${{ github.run_id }}

AppIcon.icns

@@ -5,7 +5,7 @@
 
 // MARK: - Product Info
 PRODUCT_NAME = BuildSignal
-MARKETING_VERSION = 0.0.12
+MARKETING_VERSION = 0.0.13
 CURRENT_PROJECT_VERSION = 1
 
 // MARK: - Deployment