fix(dp): Fix requests migration (magma#12411)

Migration generated by alembic was wrong, since it tried to
delete table when it was still referenced as foreign key.

Signed-off-by: Kuba Marciniszyn <kuba@freedomfi.com>

dp/cloud/python/magma/db_service/migrations/versions/973291f230c3_.py

@@ -21,10 +21,10 @@ def upgrade():
     Run upgrade
     """
     # ### commands auto generated by Alembic - please adjust! ###
-    op.drop_table('responses')
-    op.drop_table('request_states')
     op.drop_constraint('requests_state_id_fkey', 'requests', type_='foreignkey')
     op.drop_column('requests', 'state_id')
+    op.drop_table('responses')
+    op.drop_table('request_states')
     # ### end Alembic commands ###