Xcode 12.3 is now used on all GHA macOS runners.
Xcode 12.3 is now used on all GHA macOS runners.

Using Xcode 12.3, ROOT built for 10.15 also works on 11.0 and 11.1.

BioDynaMo/biodynamo,BioDynaMo/biodynamo,BioDynaMo/biodynamo,BioDynaMo/biodynamo