MAINTAINERS: remove sthemmin

Leaving Microsoft, the Hyper-V drivers have lots of other maintainers.
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Link: https://lore.kernel.org/r/20221028153741.25470-1-stephen@networkplumber.orgSigned-off-by: Wei Liu <wei.liu@kernel.org>

MAINTAINERS

@@ -9504,7 +9504,6 @@ F:	drivers/media/i2c/hi847.c
 Hyper-V/Azure CORE AND DRIVERS
 M:	"K. Y. Srinivasan" <kys@microsoft.com>
 M:	Haiyang Zhang <haiyangz@microsoft.com>
-M:	Stephen Hemminger <sthemmin@microsoft.com>
 M:	Wei Liu <wei.liu@kernel.org>
 M:	Dexuan Cui <decui@microsoft.com>
 L:	linux-hyperv@vger.kernel.org