Bump flask-sqlalchemy from 2.4.3 to 2.5.1 in /backend

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Bumps flask-sqlalchemy from 2.4.3 to 2.5.1.

Release notes

Sourced from flask-sqlalchemy's releases.

2.5.1

Fixed compatibility with SQLAlchemy 1.4 and Python 2.7.

• Changes: https://flask-sqlalchemy.palletsprojects.com/en/2.x/changelog/#version-2-5-1

2.5.0

Fixed compatibility with SQLAlchemy 1.4.

• Changes: https://flask-sqlalchemy.palletsprojects.com/en/2.x/changelog/#version-2-5-0

2.4.4

Fixes an issue with CPython 3.8.4.

• Changelog: https://flask-sqlalchemy.palletsprojects.com/en/2.x/changelog/#version-2-4-4

Changelog

Sourced from flask-sqlalchemy's changelog.

Version 2.5.1

Released 2021-03-18

• Fix compatibility with Python 2.7.

Version 2.5.0

Released 2021-03-18

• Update to support SQLAlchemy 1.4.
• SQLAlchemy URL objects are immutable. Some internal methods have changed to return a new URL instead of None. 885

Version 2.4.4

Released 2020-07-14

• Change base class of meta mixins to type. This fixes an issue caused by a regression in CPython 3.8.4. 852

Commits

• da0e0df release version 2.5.1
• 59ede18 Merge pull request #937 from pallets/2.7-compat
• 0ac1040 get_ident compat for Python 2.7
• c11fe63 release version 2.5.0
• d29b941 Merge pull request #934 from pallets/werkzeug-ident_func
• 3565f05 copy ident_func from previous Werkzeug implementation
• b0b71ff Merge pull request #933 from pallets/sqlalchemy-1.4
• 978d8d1 sqlalchemy 1.4 declarative in orm
• be457d5 work with sqlalchemy 1.4 immutable URL object
• e5f6b7a Add 'self' to 'init' method (#895)
• Additional commits viewable in compare view

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