DOC: Add Reuben Thomas as a contributor for #1765

CONTRIBUTORS.md

@@ -38,6 +38,7 @@ history and [GitHubs 'Contributors' feature](https://github.com/py-pdf/pypdf/gra
 * [sietzeberends](https://github.com/sietzeberends)
 * [Stüber, Timo](https://github.com/omit66)
 * [Thoma, Martin](https://github.com/MartinThoma): Maintainer of pypdf 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/)
+* [Thomas, Reuben](https://github.com/rrthomas)
 * [WevertonGomes](https://github.com/WevertonGomesCosta)
 * [Wilson, Huon](https://github.com/huonw)
 * ztravis