Remove macos-13 (Intel) runner from CI (#388)

macos-13 was retired by GitHub in December 2025 and no longer works.
Intel-based macOS runners are being phased out entirely by GitHub,
with only expensive *-large variants remaining as alternatives.

Closes #387

Made-with: Cursor

.github/workflows/workflow.yaml

@@ -30,7 +30,6 @@ jobs:
           - ubuntu-latest
           - windows-latest
           - macos-latest
-          - macos-13
         channel: [stable, beta, master]
         dry-run: [true, false]
         git-source:
@@ -80,7 +79,7 @@ jobs:
     strategy:
       matrix:
         operating-system:
-          [ubuntu-latest, windows-latest, macos-latest, macos-13]
+          [ubuntu-latest, windows-latest, macos-latest]
 
     steps:
       - name: Clone repository