added riysaxen-amzn as a maintainer (#869)

Signed-off-by: Riya Saxena <[email protected]>
Signed-off-by: AWSHurneyt <[email protected]>
Co-authored-by: AWSHurneyt <[email protected]>

Author: riysaxen-amzn

.github/CODEOWNERS

@@ -1 +1 @@
-* @amsiglan @AWSHurneyt @getsaurabh02 @lezzago @praveensameneni @sbcd90 @eirsep @jowg-amazon @engechas @goyamegh
+* @amsiglan @AWSHurneyt @getsaurabh02 @lezzago @praveensameneni @sbcd90 @eirsep @jowg-amazon @engechas @goyamegh @riysaxen-amzn

MAINTAINERS.md

@@ -16,3 +16,4 @@ This document contains a list of maintainers in this repo. See [opensearch-proje
 | Joanne Wang           | [jowg-amazon](https://github.com/jowg-amazon)         | Amazon      |
 | Chase Engelbrecht     | [engechas](https://github.com/engechas)               | Amazon      |
 | Megha Goyal           | [goyamegh](https://github.com/goyamegh)               | Amazon      |
+| Riya Saxena           | [riysaxen-amzn](https://github.com/riysaxen-amzn))    | Amazon      |