Update dependency macos to v26

Author: renovate[bot]

.github/workflows/main.yml

@@ -17,7 +17,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        image: [macos-15, ubuntu-24.04, windows-2025]
+        image: [macos-26, ubuntu-24.04, windows-2025]
     env:
       DOTNET_NOLOGO: 1
       DOTNET_CLI_TELEMETRY_OPTOUT: 1