ci: reduce testing for macOS 12

We have the limited hardware resources with macOS 12, and full testing
is time-consuming. So let's check only the release build on the x86_64
platform.

NO_DOC=ci
NO_TEST=ci
NO_CHANGELOG=ci

.github/workflows/osx_debug.yml

@@ -46,7 +46,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        version: [ 12, 13 ]
+        version: [ 13 ]
         arch: [ x86_64, aarch64 ]
 
     steps:

.github/workflows/osx_release.yml

@@ -46,8 +46,11 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        version: [ 12, 13 ]
+        version: [ 13 ]
         arch: [ x86_64, aarch64 ]
+        include:
+          - version: 12
+            arch: x86_64
 
     steps:
       - name: Prepare checkout

.github/workflows/osx_static_cmake.yml

@@ -47,7 +47,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        version: [ 12, 13 ]
+        version: [ 13 ]
         arch: [ x86_64, aarch64 ]
 
     steps: