Merge pull request #5895 from cylc/8.2.x-sync

🤖 Merge 8.2.x-sync into master

Author: oliver-sanders

.github/workflows/test_fast.yml

@@ -23,7 +23,7 @@ jobs:
         python-version: ['3.7', '3.8', '3.10', '3.11', '3']
         include:
           # mac os test
-          - os: 'macos-latest'
+          - os: 'macos-11'
             python-version: '3.7'  # oldest supported version
 
           # non-utc timezone test

.github/workflows/test_functional.yml

@@ -74,13 +74,13 @@ jobs:
             platform: '_remote_background_indep_tcp _remote_at_indep_tcp'
           # macos
           - name: 'macos 1/5'
-            os: 'macos-latest'
+            os: 'macos-11'
             python-version: '3.7'
             test-base: 'tests/f'
             chunk: '1/5'
             platform: '_local_background*'
           - name: 'macos 2/5'
-            os: 'macos-latest'
+            os: 'macos-11'
             python-version: '3.7'
             test-base: 'tests/f'
             chunk: '2/5'