update _make_pseudo_rgb with more accurate target wavelength for red

[HaleySchuhl]

Describe your changes update _make_pseudo_rgb with more accurate target wavelength for red. Previously, a target wavelength of 710nm for red was causing the code to grab the Red Edge band rather than the band the camera manufacturer calls red.

Type of update Is this a:

• Bug fix
• New feature or feature enhancement
• Update to documentation
• Work in progress

Associated issues Reference associated issue numbers. Does this pull request close any issues?

Additional context Add any other context about the problem here.

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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[bot]]

Here's the code health analysis summary for commits c382d06..0f52520. 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	99.7%	99.7%
Line Coverage	99.7%	99.7%
New Branch Coverage	100%	100%
New Composite Coverage	100%	100%
New Line Coverage	100%, ✅ Above Threshold	100%, ✅ Above Threshold

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