Update sponsors of components v6.1

Author: nicolas-grekas

README.md

@@ -3,16 +3,6 @@ HttpClient component
 
 The HttpClient component provides powerful methods to fetch HTTP resources synchronously or asynchronously.
 
-Sponsor
--------
-
-The Httpclient component for Symfony 5.4/6.0 is [backed][1] by [Klaxoon][2].
-
-Klaxoon is a platform that empowers organizations to run effective and
-productive workshops easily in a hybrid environment. Anytime, Anywhere.
-
-Help Symfony by [sponsoring][3] its development!
-
 Resources
 ---------
 
@@ -21,7 +11,3 @@ Resources
  * [Report issues](https://github.com/symfony/symfony/issues) and
    [send Pull Requests](https://github.com/symfony/symfony/pulls)
    in the [main Symfony repository](https://github.com/symfony/symfony)
-
-[1]: https://symfony.com/backers
-[2]: https://klaxoon.com
-[3]: https://symfony.com/sponsor