chore: update sponsor link (#6460)

Eomm · web-flow · commit 5c14e05670c8 · 2026-01-20T23:10:08.000+01:00
diff --git a/SPONSORS.md b/SPONSORS.md
@@ -17,7 +17,7 @@ or [GitHub Sponsors](https://github.com/sponsors/fastify)!
 - [Val Town, Inc.](https://opencollective.com/valtown)
 - [Handsontable - JavaScript Data Grid](https://handsontable.com/docs/react-data-grid/?utm_source=Fastify_GH&utm_medium=sponsorship&utm_campaign=library_sponsorship_2024)
 - [Lokalise - A Localization and Translation Software Tool](https://lokalise.com/?utm_source=Fastify_GH&utm_medium=sponsorship)
-- [Lambdatest](https://www.lambdatest.com/)
+- [TestMu AI](https://www.testmu.ai/)
 
 ## Tier 2
 
