Update dependency django-extensions to v2.2.9

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
django-extensions (changelog)	==2.2.6 -> ==2.2.9

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Release Notes

django-extensions/django-extensions

v2.2.9

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Changes:

• Fix: shell_plus, move notebook down the list of preferred shells
• Fix: sqldiff, fix KeyError when detecting missing (unique) indexes
• Improvement: encrypted fields, make it harder to use deprecated keyczar fields
• Locale: Removed empty localizations

v2.2.8

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Changes:

• Locale: zh_Hans, removed as it generated UnicodeDecodeError errors (#​1478)

v2.2.7

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Changes:

• Improvement: shell_plus, #​865 always add manage.py basedir to path for notebook kernel
• Improvement: docs, add zh-Hans locale
• Improvement: runserver_plus, fix broken import for werkzeug v1.0.0
• Improvement: runserver_plus, #​1461 fix always trying to load StaticFilesHandler
• Improvement: pipchecker, #​1471 fix import of PipSession

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