Use MacOS 10.15 for x86_64 build.
This version is better supported by GitHub.
@@ -14,7 +14,7 @@ jobs:
include:
- os: 'macos-11.0'
scons-options: 'ARCH=universal2'
- - os: 'macos-11.0'
+ - os: 'macos-10.15'
scons-options: 'ARCH=x86_64'
steps:
