[6.2] Remove mentions of v6.1 backers

Author: nicolas-grekas

README.md

@@ -3,23 +3,6 @@ HttpClient component
 
 The HttpClient component provides powerful methods to fetch HTTP resources synchronously or asynchronously.
 
-Sponsor
--------
-
-The Httpclient component for Symfony 6.1 is [backed][1] by [Prisma Media][2].
-
-Prisma Media has become in 40 years the n°1 French publishing group, on print and
-digitally, with 20 flagship brands of the news magazines : Femme Actuelle, GEO,
-Capital, Gala or Télé-Loisirs… Today, more than 42 million French people are in
-contact with one of our brand each month, either by leafing through a magazine,
-surfing the web, subscribing one our mobile or tablet application or listening to
-our podcasts' series. Prisma Media has successfully transformed one's business
-model : from a historic player in the world of paper, it has become in 5 years
-one of the first publishers of multi-media editorial content, and one of the
-first creators of digital solutions.
-
-Help Symfony by [sponsoring][3] its development!
-
 Resources
 ---------
 
@@ -28,7 +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://www.prismamedia.com
-[3]: https://symfony.com/sponsor