docs(sponsors): remove Elastic as a sponsor

As I no longer work there, I'm no longer benefiting from the 4hr/month
benefits that I had in the past.

Conversations are still ongoing internally as to whether they'll become
a 1hr/month sponsor.

Author: jamietanna

.github/sponsors/elastic-dark.svg

@@ -4476,18 +4476,6 @@ Please consider sponsoring us through GitHub Sponsors either [on the organisatio
 
 See [this blog post from Tidelift](https://blog.tidelift.com/paying-maintainers-the-howto) for more details on how to talk to your company about sponsoring maintainers of (Open Source) projects you depend on.
 
-We are currently sponsored for 4 hours of work a month by Elastic:
-
-<p align="center">
-	<a href="https://elastic.co?utm_source=oapi-codegen+repo&utm_medium=github+sponsorship">
-		<picture>
-		  <source media="(prefers-color-scheme: light)" srcset=".github/sponsors/elastic-light.svg">
-		  <source media="(prefers-color-scheme: dark)" srcset=".github/sponsors/elastic-dark.svg">
-		  <img alt="Elastic logo" src=".github/sponsors/elastic-dark.svg" height="100px">
-		</picture>
-	</a>
-</p>
-
 In addition, we are also generously sponsored by the following folks, each of whom provide sponsorship for 1 hour of work a month:
 
 <p align="center">