MAINTAINERS: add Sabrina to TLS maintainers

Sabrina has been very helpful reviewing TLS patches, fixing bugs,
and, I believe, the last one to implement any major feature in
the TLS code base (rekeying). Add her as a maintainer.

Acked-by: Sabrina Dubroca <sd@queasysnail.net>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250903212054.1885058-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: kuba-moo

MAINTAINERS

@@ -17850,6 +17850,7 @@ F:	net/ipv6/tcp*.c
 NETWORKING [TLS]
 M:	John Fastabend <john.fastabend@gmail.com>
 M:	Jakub Kicinski <kuba@kernel.org>
+M:	Sabrina Dubroca <sd@queasysnail.net>
 L:	netdev@vger.kernel.org
 S:	Maintained
 F:	include/net/tls.h