chore: migrate from removed macos-13 intel agent to macos-15-intel

Author: neilcampbell

.github/workflows/build-binaries.yaml

@@ -19,9 +19,9 @@ jobs:
     strategy:
       matrix:
         # macos-14 is the Apple Silicon M1 runner (mac os 14)
-        # macos-13 is the last available Intel Mac runner (mac os 13)
+        # macos-15-intel is the last available Intel Mac runner (mac os 15)
         # See https://github.com/actions/runner-images?tab=readme-ov-file#available-images
-        os: [ubuntu-22.04, windows-latest, macos-13, macos-14]
+        os: [ubuntu-22.04, windows-latest, macos-15-intel, macos-14]
 
     steps:
       - name: Set signing condition