MAINTAINERS: git://github -> https://github.com for jonmason

Github deprecated the git:// links about a year ago, so let's move to
the https:// URLs instead.
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>
Signed-off-by: Jon Mason <jdmason@kudzu.us>

MAINTAINERS

@@ -14924,7 +14924,7 @@ M:	Allen Hubbe <allenbh@gmail.com>
 L:	ntb@lists.linux.dev
 S:	Supported
 W:	https://github.com/jonmason/ntb/wiki
-T:	git git://github.com/jonmason/ntb.git
+T:	git https://github.com/jonmason/ntb.git
 F:	drivers/net/ntb_netdev.c
 F:	drivers/ntb/
 F:	drivers/pci/endpoint/functions/pci-epf-*ntb.c