Update django-cacheops requirement from ~=4.2 to ~=6.0 in /config

[dependabot-preview]

Updates the requirements on django-cacheops to permit the latest version.

Changelog

Sourced from django-cacheops's changelog.

6.0

• support and test against Python 3.9 and Django 3.1/3.2
• added custom serializers support (thx to Arcady Usov)
• support callable extra in @​cached_as() and friends
• made simple cache obey prefix
• skip JSONFields for purposes of invalidation
• configure skipped fields by internal types, classes still supported
• handle DatabaseError on transaction cleanup (Roman Gorbil)
• do not query old object if cacheops is disabled
• do not fetch deferred fields during invalidation, fixes #387 Backwards incompatible changes:
• callable extra param, including type, now behaves differently
• simple cache now uses prefix

5.1

• support subqueries in annotations (Jeremy Stretch)
• included tests into distro (John Vandenberg)
• fixed .invalidated_update(), if updated QuerySet had related fields selected (M1hacka)
• fixed possible deadlock in .invalidated_update() (M1hacka)
• fixed filtering with expressions
• fixed queries filtering in Exists (thx to Axel Wegener)
• updated min redis-py to 3.0.0

5.0.1

• fixed reverse o2o invalidation (thx to John Anderson)
• fixed unstable cache key when field validors are used
• guard against non-integer timeouts

5.0

• support Python 3.8 and Django 3.0 (thx to Misha Kalyna)
• improve model fields stamping (Alex Lokhman)
• disabled postponed invalidation when no_invalidation is applied (Vladimir)
• fixed custom manager derived from BaseManager (Eric Plaster) Backwards incompatible changes:
• dropped Python 2.7 and Djangos before 2.1
• Redis 4.0+ required

4.2

• support Django 2.1 and 2.2
• added keep_fresh option to @​cached_as (George Lee)
• pass CACHEOPS_SENTINEL options through (David Fuentes Baldomir)
• made SKIP_FIELDS and LONG_DISJUCTION configurable (Nic Wolff)
• fixed .aggregate() over .annotate() fields in Django 2.2
• fixed .bulk_create() in Django 2.2 (Grzegorz Szczepanczyk)
• fixed test database to work in environments without /dev/shm (George Lee)
• fixed proxy/abstract model bug
• added test case for issue #312 (Andy Tzeng)
• some warnings and doc-strings improvements

4.1

... (truncated)

Commits

• e2f60db Up to 6.0
• 0608485 Fix classes support in CACHEOPS_SKIP_FIELDS
• e29dcbc Make simple cache obey prefix
• 447e778 Resume testing Djangos 2.1 and 2.2 with a single python
• b4ec6f5 Skip dill test on PyPy
• a5ed1ac Simplify custom serializer interface
• 04e526a Merge branch 'itcrab-fix-pickle-attribute-error'
• ed99d76 Merge branch 'fix-pickle-attribute-error' of https://github.com/itcrab/django...
• 17ecc1a Use common JSONField in newer Djangos in tests
• 6618069 Skip pypy3 since it has some issues with SQLite on travis
• Additional commits viewable in compare view

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