🔧 Update sponsors, add Stainless (#11763)

README.md

@@ -63,6 +63,7 @@ The key features are:
 <a href="https://speakeasyapi.dev?utm_source=fastapi+repo&utm_medium=github+sponsorship" target="_blank" title="SDKs for your API | Speakeasy"><img src="https://fastapi.tiangolo.com/img/sponsors/speakeasy.png"></a>
 <a href="https://www.svix.com/" target="_blank" title="Svix - Webhooks as a service"><img src="https://fastapi.tiangolo.com/img/sponsors/svix.svg"></a>
 <a href="https://www.codacy.com/?utm_source=github&utm_medium=sponsors&utm_id=pioneers" target="_blank" title="Take code reviews from hours to minutes"><img src="https://fastapi.tiangolo.com/img/sponsors/codacy.png"></a>
+<a href="https://www.stainlessapi.com/?utm_source=fastapi&utm_medium=referral" target="_blank" title="Stainless | Generate best-in-class SDKs"><img src="https://fastapi.tiangolo.com/img/sponsors/stainless.png"></a>
 
 <!-- /sponsors -->
 

docs/en/data/sponsors.yml

@@ -51,6 +51,9 @@ silver:
   - url: https://www.codacy.com/?utm_source=github&utm_medium=sponsors&utm_id=pioneers
     title: Take code reviews from hours to minutes
     img: https://fastapi.tiangolo.com/img/sponsors/codacy.png
+  - url: https://www.stainlessapi.com/?utm_source=fastapi&utm_medium=referral
+    title: Stainless | Generate best-in-class SDKs
+    img: https://fastapi.tiangolo.com/img/sponsors/stainless.png
 bronze:
   - url: https://www.exoflare.com/open-source/?utm_source=FastAPI&utm_campaign=open_source
     title: Biosecurity risk assessments made easy.

docs/en/docs/advanced/generate-clients.md

@@ -20,7 +20,7 @@ Some of them also ✨ [**sponsor FastAPI**](../help-fastapi.md#sponsor-the-autho
 
 And it shows their true commitment to FastAPI and its **community** (you), as they not only want to provide you a **good service** but also want to make sure you have a **good and healthy framework**, FastAPI. 🙇
 
-For example, you might want to try <a href="https://speakeasyapi.dev/?utm_source=fastapi+repo&utm_medium=github+sponsorship" class="external-link" target="_blank">Speakeasy</a>.
+For example, you might want to try <a href="https://speakeasyapi.dev/?utm_source=fastapi+repo&utm_medium=github+sponsorship" class="external-link" target="_blank">Speakeasy</a> and <a href="https://www.stainlessapi.com/?utm_source=fastapi&utm_medium=referral" class="external-link" target="_blank">Stainless</a>.
 
 There are also several other companies offering similar services that you can search and find online. 🤓