Docs: fix URL for PTSA (#5935)

Author: shoyer

doc/ecosystem.rst

@@ -58,7 +58,7 @@ Machine Learning
 
 Other domains
 ~~~~~~~~~~~~~
-- `ptsa <https://pennmem.github.io/ptsa_new/html/index.html>`_: EEG Time Series Analysis
+- `ptsa <https://pennmem.github.io/ptsa/html/index.html>`_: EEG Time Series Analysis
 - `pycalphad <https://pycalphad.org/docs/latest/>`_: Computational Thermodynamics in Python
 - `pyomeca <https://pyomeca.github.io/>`_: Python framework for biomechanical analysis