Update flask-sqlalchemy requirement from ~=2.3.2 to ~=2.4.4

[dependabot]

Updates the requirements on flask-sqlalchemy to permit the latest version.

Release notes

Sourced from flask-sqlalchemy's releases.

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 2.4.4

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. :issue:852

Version 2.4.3

Released 2020-05-26

• Deprecate SQLALCHEMY_COMMIT_ON_TEARDOWN as it can cause various design issues that are difficult to debug. Call db.session.commit() directly instead. :issue:216

Version 2.4.2

Released 2020-05-25

• Fix bad pagination when records are de-duped. :pr:812

Version 2.4.1

Released 2019-09-24

• Fix AttributeError when using multiple binds with polymorphic models. :pr:651

Version 2.4.0

Released 2019-04-24

• Make engine configuration more flexible. (:pr:684)
• Address SQLAlchemy 1.3 deprecations. (:pr:684)
• get_or_404() and first_or_404() now accept a description parameter to control the 404 message. (:issue:636)
• Use time.perf_counter for Python 3 on Windows. (:issue:638)
• Drop support for Python 2.6 and 3.3. (:pr:687)
• Add an example of Flask's tutorial project, Flaskr, adapted for Flask-SQLAlchemy. (:pr:720)

... (truncated)

Commits

• e5fcf62 release version 2.4.4
• 36efd3b Merge pull request #854 from kam193/fix/python_3.8.4
• a2f2e95 subclass meta mixins from type
• d257601 release version 2.4.3
• b5f218c Merge pull request #829 from pallets/deprecate-commit-on-teardown
• b22958a deprecate COMMIT_ON_TEARDOWN
• 13d6537 fix release date
• a19ca9b Merge pull request #814 from pallets/release/2.4.2
• 77fb29c Release 2.4.2
• 723b56b Bumped version number
• Additional commits viewable in compare view

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