Update dependency django-colorfield to ^0.6.0

This MR contains the following updates:

Package	Type	Update	Change
django-colorfield	dependencies	minor	^0.5.0 -> ^0.6.0

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Release Notes

fabiocaccamo/django-colorfield

v0.6.0

Compare Source

• Added image_field option.
• Added python 3.10 / django 4.0 support.
• Added more tests and increased coverage.
• Fixed tests warnings.
• Replaced Travis CI with GitHub actions workflow.

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