Add deprecation warning about label from the detect color card function

[HaleySchuhl]

Describe your changes
Adds a deprecation warning that we plan to remove the label parameter input from detect_color_card and auto_correct_color (since the trait of chip size is now a metadata term and therefore doesn't utilize a label).

Type of update
Is this a:

• Bug fix
• feature enhancement

Associated issues

Additional context
Technically a breaking change compared to before the chip size was converted to a metadata term.

For the reviewer
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• PR functionality reviewed in a Jupyter Notebook
• All tests pass
• Test coverage remains 100%
• Documentation tested
• New documentation pages added to plantcv/mkdocs.yml
• Changes to function input/output signatures added to updating.md
• Code reviewed
• PR approved

[deepsource-io]

Here's the code health analysis summary for commits f984cb2..d6db91b. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
Python	✅ Success		View Check ↗
Test coverage	✅ Success		View Check ↗

Code Coverage Report

Metric	Aggregate	Python
Branch Coverage	100%	100%
Composite Coverage	100%	100%
Line Coverage	100%	100%
New Branch Coverage	100%	100%
New Composite Coverage	100%	100%
New Line Coverage	100%, ✅ Above Threshold	100%, ✅ Above Threshold

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