fix-PTC-W0010

[k034b363]

Describe your changes
Deepsource identified 3 occurrences of files being opened without the "with ... as" structure. Because this requires the file.close() to explicitly release the file, it is not preferred. This pull request converts those file open lines into the indented "with" structure.

Type of update
Deepsource issue fix

Associated issues
N/A

Additional context
N/A

For the reviewer
See this page for instructions on how to review the pull request.

• 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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0fc53c4) 100.00% compared to head (aaa3970) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1435   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          158       158           
  Lines         6944      6943    -1     
=========================================
- Hits          6944      6943    -1     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
plantcv/learn/naive_bayes.py	100.00% <100.00%> (ø)
plantcv/plantcv/classes.py	100.00% <100.00%> (ø)
plantcv/utils/converters.py	100.00% <100.00%> (ø)