MAINTAINERS: Update e-mail in Xen maintainership

Changing e-mail because of leaving EPAM.

Signed-off-by: Anastasiia Lukianenko <vicooodin@gmail.com>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 64648c2..9c2d6fe 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1307,7 +1307,7 @@
 F:	cmd/x86/
 
 XEN
-M:	Anastasiia Lukianenko <anastasiia_lukianenko@epam.com>
+M:	Anastasiia Lukianenko <vicooodin@gmail.com>
 M:	Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
 S:	Maintained
 F:	arch/arm/cpu/armv8/xen/