Update dependency django-colorfield to ^0.12.0

This MR contains the following updates:

Package	Type	Update	Change
django-colorfield	dependencies	minor	^0.11.0 -> ^0.12.0

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Release Notes

fabiocaccamo/django-colorfield

v0.12.0

Compare Source

• Support plain Django forms. #​211
• Bump requirements.
• Bump pre-commit hooks.
• Bump actions.

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