ci: gh actions: bump golang on mac to 1.16
ci: gh actions: bump golang on mac to 1.16

We used golang 1.15 on mac only because it
was the latest version available.

Signed-off-by: Francesco Romani <c7100b580e6017ef67482ace46578cdd2d2e0dfe@redhat.com>

jaypipes/ghw,jaypipes/ghw