(#370) Bump macos-12 runner to macos-13

Author: nils-a

.github/workflows/build.yml

@@ -19,7 +19,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os:  [ ubuntu-22.04, windows-2022, macos-12 ]
+        os:  [ ubuntu-22.04, windows-2022, macos-13 ]
 
     env:
       AZURE_PASSWORD: ${{ secrets.AZURE_PASSWORD }}