Update CoC link in README (#3453)

Updating the CoC link in the README's Code of Conduct section reflects recent updates. I've linked it to the CoC tab in parsl/parsl so users aren't unnecessarily routed to the .github repo.

README.rst

@@ -122,7 +122,7 @@ Parsl is supported in Python 3.8+. Requirements can be found `here <requirements
 Code of Conduct
 ===============
 
-Parsl seeks to foster an open and welcoming environment - Please see the `Parsl Code of Conduct <https://github.com/Parsl/parsl/blob/master/CODE_OF_CONDUCT.md>`_ for more details.
+Parsl seeks to foster an open and welcoming environment - Please see the `Parsl Code of Conduct <https://github.com/Parsl/parsl?tab=coc-ov-file#parsl-code-of-conduct>`_ for more details.
 
 Contributing
 ============