Update dependency django-colorfield to ^0.8.0

This MR contains the following updates:

Package	Type	Update	Change
django-colorfield	dependencies	minor	^0.7.0 -> ^0.8.0

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Release Notes

fabiocaccamo/django-colorfield

v0.8.0

Compare Source

• Drop Python < 3.8 and Django < 2.2 support.

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