Add mwtrew and zetter-rpf to .clabot contributors (#656)

## Status

- Closes #[issue number will be auto-linked]

## Points for consideration:

None

## What's changed?

- Added `mwtrew` and `zetter-rpf` to `.clabot` contributors list
- Maintained case-insensitive alphabetical ordering

## Steps to perform after deploying to production

None

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<details>

<summary>Original prompt</summary>

> 
> ----
> 
> *This section details on the original issue you should resolve*
> 
> <issue_title>Update .clabot to include Chris and Matthew</issue_title>
> <issue_description>The CLAbot file does not include new members to the
team.
> 
> Update .CLABot file to include
> 
> - @zetter-rpf 
> - @mwtrew 
> 
> Ensure the list is in alphabetical order</issue_description>
> 
> ## Comments on the Issue (you are @copilot in this section)
> 
> <comments>
> </comments>
> 


</details>



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- Fixes #655

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: adrian-rpf <193916339+adrian-rpf@users.noreply.github.com>

Author: Copilot

.clabot

@@ -24,12 +24,14 @@
     "magdalenajadach",
     "MarcScott",
     "Mohamed-RPF",
+    "mwtrew",
     "patch0",
     "peconia",
     "PetarSimonovic",
     "pjbRPF",
     "sra405",
-    "tuzz"
+    "tuzz",
+    "zetter-rpf"
   ],
   "message": "We require contributors to sign our Contributor License Agreement, and we don't have you on file. In order for us to review and merge your code, please complete [this form](https://form.raspberrypi.org/4873530) and we'll get you added and review your contribution as soon as possible."
 }