Change set of MacOS builders in CI as Github dropped 10.15

Author: TheBlueMatt

.github/workflows/build.yml

@@ -486,8 +486,9 @@ jobs:
     strategy:
       matrix:
         include:
-          - platform: macos-10.15
           - platform: macos-11
+          - platform: macos-12
+          - platform: macos-13
       fail-fast: false
     runs-on: ${{ matrix.platform }}
     steps: