docs: fix link for styled system in acknowledgements section (#3504)

Fix styled system link

Author: maurer2

README.md

@@ -125,7 +125,7 @@ The development of Panda was only possible due to the inspiration and ideas from
 - [Stitches](https://stitches.dev/) - for inspiring the recipes and variants API
 - [Tailwind CSS](https://tailwindcss.com/) - for inspiring the JIT compiler and strategy
 - [Class Variance Authority](https://cva.style/) - for inspiring the `cva` name
-- [Styled System](https://styled-system.com/) - for the initial idea of Styled Props
+- [Styled System](https://github.com/styled-system/styled-system) - for the initial idea of Styled Props
 - [Linaria](https://linaria.dev/) - for inspiring the initial atomic css strategy
 - [Uno CSS](https://unocss.dev) - for inspiring the studio and astro integration
 - [Goober](https://goober.rocks/) - for tiny and performant js functions in template literal styles