minor symfony#46558 [Runtime] List Fulgens as backer of version 6.1 (nicolas-grekas)

This PR was merged into the 6.1 branch.

Discussion
----------

[Runtime] List Fulgens as backer of version 6.1

| Q             | A
| ------------- | ---
| Branch?       | 6.1
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | -
| License       | MIT
| Doc PR        | -

Thanks to them!

/cc @alexandre-castelain

Commits
-------

2cbfc80 [Runtime] List Fulgens as backer of version 6.1

Author: fabpot

src/Symfony/Component/Runtime/README.md

@@ -3,6 +3,17 @@ 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
 ---------
 
@@ -11,3 +22,7 @@ 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