Add daniel to become a maintainer (opensearch-project#9677)

Signed-off-by: abbyhu2000 <abigailhu2000@gmail.com>

Author: abbyhu2000

.github/CODEOWNERS

@@ -1 +1 @@
-*   @ananzh @kavilla @AMoo-Miki @ashwin-pc @joshuarrrr @abbyhu2000 @zengyan-amazon @zhongnansu @manasvinibs @ZilongX @Flyingliuhub @curq @bandinib-amzn @SuZhou-Joe @ruanyl @BionIT @xinruiba @zhyuanqi @mengweieric @LDrago27 @virajsanghvi @sejli @joshuali925 @huyaboo @angle943 @Maosaic @wanglam
+*   @ananzh @kavilla @AMoo-Miki @ashwin-pc @joshuarrrr @abbyhu2000 @zengyan-amazon @zhongnansu @manasvinibs @ZilongX @Flyingliuhub @curq @bandinib-amzn @SuZhou-Joe @ruanyl @BionIT @xinruiba @zhyuanqi @mengweieric @LDrago27 @virajsanghvi @sejli @joshuali925 @huyaboo @angle943 @Maosaic @wanglam @d-buckner

MAINTAINERS.md

@@ -34,6 +34,7 @@ This document contains a list of maintainers in this repo. See [opensearch-proje
 | Justin Kim                | [angle943](https://github.com/angle943)             | Amazon      |
 | Joey Liu                  | [Maosaic](https://github.com/Maosaic)               | Amazon      |
 | Lin Wang                  | [wanglam](https://github.com/wanglam)               | Amazon      |
+| Daniel Rowe               | [d-buckner](https://github.com/d-buckner)           | Amazon      |
 
 ## Emeritus
 
@@ -44,4 +45,4 @@ This document contains a list of maintainers in this repo. See [opensearch-proje
 | Bishoy Boktor | [boktorbb](https://github.com/boktorbb)       | Amazon      |
 | Sean Neumann  | [seanneumann](https://github.com/seanneumann) | Contributor |
 | Kristen Tian  | [kristenTian](https://github.com/kristenTian) | Amazon      |
-| Matt Provost  | [BSFishy](https://github.com/BSFishy)         | Amazon      |
+| Matt Provost  | [BSFishy](https://github.com/BSFishy)         | Amazon      |