requirements.txt: update the need sqlalchemy version to 1.3.12 and above. #1454
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When the SQLAlchemy version is less than 1.3.11, there is an error like this
File "/usr/local/lib/python3.6/site-packages/alembic/ddl/sqlite.py", line 56, in requires_recreate_in_batch and col.server_default.persisted AttributeError: 'NoneType' object has no attribute 'persisted'
The sqlalchemy/alembic repo fix compat issue with older SQLAlchemy versions in
sqlalchemy/alembic@2866272 and point the issue is caused by the lower SQLAlchemy version (less than SQLAlchemy 1.3.11)
so it's better for us to update the need SQLAlchemy version from 1.3 to 1.3.12 or update the need alembic version from 1.1.0 to 1.11.0. Obviouly, update the need sqlalchemy version to 1.3.12 and above is better than update the need alembic version to 1.11.0.
Fixes #1453
Signed-off-by: YiLin.Li YiLin.Li@linux.alibaba.com