rename the nightly task 'Nightly Advanced Tests'

Signed-off-by: Chris Trevino <darthtrevino@gmail.com>

.github/workflows/nightly-tests.yml

@@ -1,6 +1,6 @@
 # This workflow will install Python dependencies, run tests and lint with a variety of Python versions
 # For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions
-name: DoWhy CI
+name: Nightly Advanced Tests
 
 on:
   schedule: