fix(deps): update dependency flask-migrate to v4.0.6

This MR contains the following updates:

Package	Type	Update	Change
flask-migrate	dependencies	patch	4.0.5 -> 4.0.6

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Release Notes

miguelgrinberg/flask-migrate (flask-migrate)

v4.0.6: Release 4.0.6

Compare Source

See CHANGES.md for release notes.

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