Merge pull request #3834 from jupyterhub/update-image-requirements

hub image: refreeze requirements.txt

Author: manics

images/hub/requirements.txt

@@ -222,7 +222,7 @@ six==1.17.0
     #   onetimepass
     #   python-dateutil
     #   rfc3339-validator
-sqlalchemy==2.0.47
+sqlalchemy==2.0.48
     # via
     #   alembic
     #   jupyterhub

images/singleuser-sample/requirements.txt

@@ -272,7 +272,7 @@ six==1.17.0
     #   rfc3339-validator
 soupsieve==2.8.3
     # via beautifulsoup4
-sqlalchemy==2.0.47
+sqlalchemy==2.0.48
     # via
     #   alembic
     #   jupyterhub