Note that this is just the native compiler, which is used to build the toolchain we use to build the actual binaries.
Partially motivated by #29091, where it could now be a bit confusing if we are explicitly using GCC 10 in our release toolchain, when our minimum required is 11 (this can’t be bumped to 12 due to build issues with native tools).
At the same time, remove gcc-toolchain "static"
from the macOS build env.