MAINTAINERS: Add Uladzislau Rezki as RCU maintainer

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Uladzislau Rezki <urezki@gmail.com>

MAINTAINERS

@@ -18868,6 +18868,7 @@ M:	Neeraj Upadhyay <neeraj.upadhyay@kernel.org> (kernel/rcu/tasks.h)
 M:	Joel Fernandes <joel@joelfernandes.org>
 M:	Josh Triplett <josh@joshtriplett.org>
 M:	Boqun Feng <boqun.feng@gmail.com>
+M:	Uladzislau Rezki <urezki@gmail.com>
 R:	Steven Rostedt <rostedt@goodmis.org>
 R:	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 R:	Lai Jiangshan <jiangshanlai@gmail.com>