Update sponsor link

Author: gasparnagy

_pages/sponsorship.md

@@ -33,7 +33,7 @@ We are thankful to our sponsors who support the Reqnroll open-source project. Re
 </div>
 
 <div class="silver-sponsor-block">
-<figure><a href="https://www.testmuai.com/"><img decoding="async" width="300" height="100" src="{{ site.url }}/assets/images/testmuai-logo-300x100.webp" alt="TestMu AI sponsors Reqnroll by $50 / mo" title="Info Support sponsors Reqnroll by $200 / mo" /></a><figcaption><strong><a href="https://www.testmuai.com/">TestMu AI</a></strong> (formerly LambdaTest) sponsors Reqnroll by $50 / mo</figcaption></figure>
+<figure><a href="https://www.testmuai.com/?utm_medium=sponsor&utm_source=reqnroll"><img decoding="async" width="300" height="100" src="{{ site.url }}/assets/images/testmuai-logo-300x100.webp" alt="TestMu AI sponsors Reqnroll by $50 / mo" title="TestMu AI sponsors Reqnroll by $50 / mo" /></a><figcaption><strong><a href="https://www.testmuai.com/?utm_medium=sponsor&utm_source=reqnroll">TestMu AI</a></strong> (formerly LambdaTest) sponsors Reqnroll by $50 / mo</figcaption></figure>
 </div>
 
 
@@ -104,4 +104,4 @@ The money we collect from the sponsors (or the profit of the paid subscription p
 *   **Contributor compensation:** Pay compensation for open source contributors for their work (budget: as needed and lasts, target: $80/h gross)
 *   **Paid workforce for special feature implementations:** hire experts for helping with concrete tasks (budget: ad hoc)
 
-For all spendings we provide full transparency through our financial hosts: [Open Source Collective (USD)](https://opencollective.com/reqnroll) and Open Collective Europe (EUR).
+For all spendings we provide full transparency through our financial hosts: [Open Source Collective (USD)](https://opencollective.com/reqnroll) and Open Collective Europe (EUR).