limit flask-migrate to the previous major version so flask migration still works

miguelgrinberg/Flask-Migrate#558

Author: MoralCode

Pipfile

@@ -23,7 +23,7 @@ apispec-webframeworks = "~=0.5.2"
 mysql-connector-python = "8.0.24"
 python-jose = "*"
 python-dotenv = "*"
-flask-migrate = "*"
+flask-migrate = "~=3.0.0"
 requests = "*"
 sentry-sdk = "*"
 psycopg2-binary = "*"