Add statsmodels to the dependencies

setup.cfg

@@ -271,6 +271,8 @@ ignore_missing_imports = true
 ignore_missing_imports = true
 [mypy-sqlalchemy.*]
 ignore_missing_imports = true
+[mypy-statsmodels.*]
+ignore_missing_imports = true
 [mypy-utm.*]
 ignore_missing_imports = true
 
@@ -282,6 +284,8 @@ cache_dir = .cache/pytest
 console_output_style = count
 env =
     TESTING=true
+filterwarnings =
+    ignore:::patsy.*
 markers =
     db: (integration) tests touching the database
     e2e: non-db and non-r integration tests