Add macos-12 to Github workflow runners

Change-Id: I7fc01ff5fe8b8a9d4e93e7536ca80a6aa37a870d

.github/workflows/macos.yml

diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index 03e5f8d..dcb6975 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -17,6 +17,7 @@
       matrix:
         os:
           - macos-11
+          - macos-12
         build_type:
           - Release
         lib: