macos intel builds - use macos15

Author: RamseyK

.github/workflows/build.yml

@@ -21,7 +21,7 @@ jobs:
         include:
           - runner: macos-15
             arch: arm64
-          - runner: macos-13
+          - runner: macos-15
             arch: x86_64
     runs-on: ${{ matrix.runner }}
     steps: