DOC: Add Sascha Rogmann as a contributor

CONTRIBUTORS.md

@@ -22,6 +22,7 @@ history and [GitHubs 'Contributors' feature](https://github.com/py-pdf/PyPDF2/gr
 * [Pinheiro, Arthur](https://github.com/xilopaint)
 * [programmarchy](https://github.com/programmarchy)
 * [pubpub-zz](https://github.com/pubpub-zz): involved in community development
+* [Rogmann, Sascha](https://github.com/srogmann)
 * [sietzeberends](https://github.com/sietzeberends)
 * [Stüber, Timo](https://github.com/omit66)
 * [Thoma, Martin](https://github.com/MartinThoma): Maintainer of PyPDF2 since April 2022. I hope to build a great community with many awesome contributors. [LinkedIn](https://www.linkedin.com/in/martin-thoma/) | [StackOverflow](https://stackoverflow.com/users/562769/martin-thoma) | [Blog](https://martin-thoma.com/)