quick fix for `s3_utilities_mixin.py`

[JanghyunJK]

Pull request overview

I was just trying to run postprocessing with main branch and noticed we might need json in s3_utilities_mixin.py. Just throwing in a quick PR. I'm seeing maybe @rHorsey might be the right person to confirm?

Pull Request Author

This pull request makes changes to (select all the apply):

• [ ] Documentation
• [ ] Infrastructure (includes apptainer image, buildstock batch, dependencies, continuous integration tests)
• [ ] Sampling
• [ ] Workflow Measures
• [ ] Upgrade Measures
• [ ] Reporting Measures
• [x] Postprocessing

Author pull request checklist:

• [x] Tagged the pull request with the appropriate label (documentation, infrastructure, sampling, workflow measure, upgrade measure, reporting measure, postprocessing) to help categorize changes in the release notes.
• [ ] Added tests for new measures
• [ ] Updated measure .xml(s)
• [ ] Register values added to comstock_column_definitions.csv
• [ ] Both options_lookup.tsv files updated
• [ ] 10k+ test run
• [ ] Change documentation written
• [ ] Measure documentation written
• [ ] ComStock documentation updated
• [ ] Changes reflected in example .yml files
• [ ] Changes reflected in README.md files
• [ ] Added 'See ComStock License' language to first two lines of each code file
• [ ] Implements corresponding measure tests and indexing path in test/measure_tests.txt or/and test/resource_measure_tests.txt
• [ ] All new and existing tests pass the CI

Review Checklist

This will not be exhaustively relevant to every PR.

• [ ] Perform a code review on GitHub
• [ ] All related changes have been implemented: data and method additions, changes, tests
• [ ] If fixing a defect, verify by running develop branch and reproducing defect, then running PR and reproducing fix
• [ ] Reviewed change documentation
• [ ] Ensured code files contain License reference
• [ ] Results differences are reasonable
• [ ] Make sure the newly added measures has been added with tests and indexed properly
• [ ] CI status: all tests pass

[eringold]

Yeah I had to do that too in a recent PR

[JanghyunJK]

oh cool! in that case, closing this per https://github.com/NREL/ComStock/pull/231