Add cocomarine to CLA bot allowlist (#764)

<!-- CURSOR_AGENT_PR_BODY_BEGIN -->

## Points for consideration:

- Security: N/A (config allowlist change only)
- Performance: N/A

## What's changed?

- Added `cocomarine` to `.clabot` `contributors` allowlist so CLA bot
recognizes the user.

## Steps to perform after deploying to production

- None
<!-- CURSOR_AGENT_PR_BODY_END -->

[Slack
Thread](https://raspberrypifoundation.slack.com/archives/C02JBAA2NFP/p1775558871550259?thread_ts=1775558871.550259&cid=C02JBAA2NFP)

<div><a
href="https://cursor.com/agents/bc-f56b5c61-9c3a-5e74-9b92-42fe71e65b79"><picture><source
media="(prefers-color-scheme: dark)"
srcset="https://cursor.com/assets/images/open-in-web-dark.png"><source
media="(prefers-color-scheme: light)"
srcset="https://cursor.com/assets/images/open-in-web-light.png"><img
alt="Open in Web" width="114" height="28"
src="https://cursor.com/assets/images/open-in-web-dark.png"></picture></a>&nbsp;<a
href="https://cursor.com/background-agent?bcId=bc-f56b5c61-9c3a-5e74-9b92-42fe71e65b79"><picture><source
media="(prefers-color-scheme: dark)"
srcset="https://cursor.com/assets/images/open-in-cursor-dark.png"><source
media="(prefers-color-scheme: light)"
srcset="https://cursor.com/assets/images/open-in-cursor-light.png"><img
alt="Open in Cursor" width="131" height="28"
src="https://cursor.com/assets/images/open-in-cursor-dark.png"></picture></a>&nbsp;</div>

Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Adrian Lansdown <adrian-rpf@users.noreply.github.com>

Author: adrian-rpf

.clabot

@@ -5,6 +5,7 @@
     "ce-rpf",
     "chris.lowis@gofreerange.com",
     "chrisroos",
+    "cocomarine",
     "conorriches",
     "Copilot",
     "create-issue-branch",