[6.2] Remove mentions of v6.1 backers

Author: nicolas-grekas

README.md

@@ -3,17 +3,6 @@ Runtime Component
 
 Symfony Runtime enables decoupling applications from global state.
 
-Sponsor
--------
-
-The Runtime component for Symfony 6.1 is [backed][1] by [Fulgens][2].
-
-Fulgens is a human-sized company founded in 2018. Specialized in development, we
-provide support, analysis and training. Symfony being at the heart of our work,
-we are committed to contribute to its development at our own scale.
-
-Help Symfony by [sponsoring][3] its development!
-
 Resources
 ---------
 
@@ -22,7 +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://fulgens.be
-[3]: https://symfony.com/sponsor