Upgrade setup-miniconda to v4 for Node.js compatibility

[RHammond2]

Upgrade CI workflow to use setup-miniconda v4 to avoid Node.js deprecation

This PR bumps the conda-incubator/setup-miniconda action from v3 to v4, which updates the Node.js version from 20.x (deprecated) to 24.x.

Section 1: Type of Contribution

• Feature Enhancement
  • Framework
  • New Model
  • Updated Model
  • Tools/Utilities
  • Other (please describe):
• Bug Fix
• Documentation Update
• CI Changes
• Other (please describe):

Section 2: Draft PR Checklist

N/A

Section 3: General PR Checklist

• PR description thoroughly describes the new feature, bug fix, etc.
• Added tests for new functionality or bug fixes
• Tests pass (If not, and this is expected, please elaborate in the Section 6: Test Results)
• Documentation
  • Docstrings are up-to-date
  • Related docs/ files are up-to-date, or added when necessary
  • Documentation has been rebuilt successfully
  • Examples have been updated (if applicable)
• CHANGELOG.md
  • At least one complete sentence has been provided to describe the changes made in this PR
  • After the above, a hyperlink has been provided to the PR using the following format:
    "A complete thought. [PR XYZ]((https://github.com/NatLabRockies/H2Integrate/pull/XYZ)", where
    XYZ should be replaced with the actual number.
  • N/A: CI Action changes only, and no version bump required.

Section 4: Related Issues

N/A

Section 5: Impacted Areas of the Software

Section 5.1: New Files

N/A

Section 5.2: Modified Files

• .github/workflows/ci.yml: setup-miniconda v3 -> v4

Section 6: Additional Supporting Information

When checking the CI cron job, I noticed a significant number of warnings relating to Node.js deprecations. I believe I fixed this in the develop branch with the expectation of a near-term version release, but that has not happened yet, so I am submitting the change directly to main as well.

Section 7: Test Results, if applicable

N/A

Section 8 (Optional): New Model Checklist

N/A