MAINTAINERS: git://github -> https://github.com for linux-test-project

Github deprecated the git:// links about a year ago, so let's move to
the https:// URLs instead.

Link: https://lkml.kernel.org/r/20221013214638.30953-1-palmer@rivosinc.com


Reported-by: Conor Dooley <conor.dooley@microchip.com>
  Link: https://github.blog/2021-09-01-improving-git-protocol-security-github/


Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Reviewed-by: Cyril Hrubis <chrubis@suse.cz>
Reviewed-by: Petr Vorel <pvorel@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>