- upgrade macos runners to macos 11

Author: fbergmann

.github/workflows/experimental_wheels.yml

@@ -32,7 +32,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-20.04, windows-2019, macos-10.15]
+        os: [ubuntu-20.04, windows-2019, macos-11]
         python_version: ['cp37-*', 'cp38-*', 'cp39-*', 'cp310-*', 'cp311-*']
 
     steps:

.github/workflows/wheels.yml

@@ -27,7 +27,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-20.04, windows-2019, macos-10.15]
+        os: [ubuntu-20.04, windows-2019, macos-11]
         python_version: ['cp37-*', 'cp38-*', 'cp39-*', 'cp310-*', 'cp311-*']
 
     steps: