Update dependency django-jinja to v2.7.0

[renovate]

This PR contains the following updates:

Package	Update	Change
django-jinja	minor	==2.4.1 -> ==2.7.0

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Release Notes

niwinz/django-jinja

v2.7.0

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• Fixed loading template names with backslashes on Windows (#​249).
• Added Django's json_script filter for Django 2.1 and higher.
• Fixed docs site stylesheet.
• Added Django 3.1 support.
• Removed Django 1.11 support.
• Added Python 3.9 (rc1) to test suite.
• Clarified "not recommended" usage of context processors with django-jinja in the docs.

v2.6.0

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• Documented compatibility changes made in version 2.5.0.
• Cut new release to reflect this in package metadata.

v2.5.0

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• Fix compatibility issues with Django 3.0, minimum version now 1.11.
• Dropped support for Python 2.7, 3.4, adding support through 3.8.

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