MINOR: Add Deshan Xiao to committers page

### What changes were proposed in this pull request?
This PR aims to add Deshan Xiao to the committers page.

### Why are the changes needed?
To keep the list of committers for the ORC website up to date.

### How was this patch tested?
N/A

### Was this patch authored or co-authored using generative AI tooling?
No

Closes #1747 from deshanxiao/deshanxiao-minor.

Authored-by: deshanxiao <deshanxiao@microsoft.com>
Signed-off-by: deshanxiao <deshanxiao@microsoft.com>

site/develop/committers.md

@@ -16,6 +16,7 @@ Chinna Rao Lalam        | chinnaraol   | Committer
 Chaoyu Tang             | ctang        | Committer
 Carl Steinbach          | cws          | Committer
 Daniel Dai              | daijy        | Committer
+Deshan Xiao             | deshanxiao   | Committer
 Dongjoon Hyun           | dongjoon     | PMC
 Deepak Majeti           | mdeepak      | PMC
 Eugene Koifman          | ekoifman     | PMC