Bump django-extensions from 2.2.9 to 3.1.3 in /requirements

[dependabot]

Bumps django-extensions from 2.2.9 to 3.1.3.

Changelog

Sourced from django-extensions's changelog.

3.1.3

Changes:

• Fix: Django 3.2, Run tests against Django 3.2
• Fix: Django 3.2, Handle warnings for default_app_config (#1654)
• Fix: sqldiff, Fix for missing field/index in model case

3.1.2

Changes:

• Improvement: shell_plus, not save ipython history when using Jupyter
• Improvement: docs, fix spelling mistakes
• Improvement: tests, move to Github Actions instead of Travis
• Improvement: drop_test_database, delete all cloned test databases (#1637)
• Improvement: setup.py, Added minimum Django>=2.2 version to PyPI package
• Improvement: shell_plus, fix --command globals / locals error

3.1.1.post1

Changes:

• Improvement: setup.py, Added minimum Django>=2.2 version to PyPI package

3.1.1

Changes:

• Improvement: graph_models, add option --app-labels
• Improvement: shell_plus, update shell_plus for jupyterlab 3
• Improvement: tests, add Python 3.9

3.1.0

Changes:

• Improvement: pipchecker, sleep 60s if pypi raises a fault
• Improvement: add django_zero_downtime_migrations to list of supported postgresql engines
• Improvement: use list of supported database engines from settings for all database commands
• Improvement: reset_db, documentation
• Fix: tests, Python 3.9 fixes for some tests
• Fix: runserver_plus, parsing of RUNSERVER_PLUS_EXTRA_FILES

3.0.9

... (truncated)

Commits

• 7032be8 v3.1.3
• a85bcac fix: Handle warnings for default_app_config (#1654)
• 912fcc8 Fix sqldiff for missing field/index in model case (#1651)
• 3079048 Run tests against Django 3.2 (#1648)
• d135e66 bumped version number
• 4c61475 v3.1.2
• bf745e2 merge branch 'master' of github.com:django-extensions/django-extensions
• fe5f961 fix shell_plus --command globals / locals error
• 29af891 Merge commit '2c08a51'
• 2c08a51 v3.1.1.post1 added minimum Django>=2.2 version
• Additional commits viewable in compare view

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[dependabot]

Looks like django-extensions is up-to-date now, so this is no longer needed.