update announcement

Author: yoelcortes

docs/conf.py

@@ -301,7 +301,7 @@ def format_annotation(annotation, config, *args, **kwargs):
     },
     "show_toc_level": 2,
     "announcement": (
-        "<p>Bioreactor modeling workshop on May 22, "
+        "<p>Workshop on Uncertainty, Sensitivity, and Optimization in October, "
         "<a href='https://docs.google.com/spreadsheets/d/1QlP7iSZrLHkUxhk-2R8_QWomh3qHfkchJK1EvM5cpyo/edit?usp=sharing'>sign up here</a>!</p>"
     ),
     "external_links": [