Add Endava as backer of the pack

README.md

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+Sponsor
+-------
+
+The test pack for Symfony 6.1/6.2 is [backed][1] by [Endava][2].
+
+Endava is reimagining the relationship between people and technology.
+By leveraging next-generation technologies, our agile, multi-disciplinary
+teams provide a combination of Product & Technology Strategies, Intelligent
+Experiences, and World Class Engineering to help our clients become more
+engaging, responsive, and efficient.
+
+Help Symfony by [sponsoring][3] its development!
+
+[1]: https://symfony.com/backers
+[2]: https://www.endava.com
+[3]: https://symfony.com/sponsor