Fix diverging heads for alembic migrations (#2347)

Fix diverging heads for alembic migrations

Both me and Matej have created a migration on top of the same version, making migrations diverging.

Reviewed-by: Laura Barcziová

Author: softwarefactory-project-zuul[bot]

alembic/versions/31111f804dec_add_onboarded_check_in_gitprojectmodel_.py

@@ -11,7 +11,7 @@
 
 # revision identifiers, used by Alembic.
 revision = "31111f804dec"
-down_revision = "a3a17014c282"
+down_revision = "ab4c11acf5e1"
 branch_labels = None
 depends_on = None