Update MacOS version in build workflow

Signed-off-by: Stefan Charsley <[email protected]>

Author: charsleysa

.github/workflows/builds.yml

@@ -346,7 +346,7 @@ jobs:
         optimization: [0,1,2,3,4,5,6,7,8,9]
       fail-fast: false
     name: MacOS - Demo Test -o${{ matrix.optimization }}
-    runs-on: macos-13
+    runs-on: macos-26
     timeout-minutes: 15
     needs: macos-build
     steps: