Update MiRS reader coefficient files to newer version

[djhoese]

We got new versions of the coefficients. This PR updates the versions used by the reader to the new versions I uploaded to zenodo.

• Closes #xxxx
• Tests added
• Fully documented
• Add your name to AUTHORS.md if not there already

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a5003a5) 95.32% compared to head (8c79995) 95.32%.
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2679   +/-   ##
=======================================
  Coverage   95.32%   95.32%           
=======================================
  Files         371      371           
  Lines       52435    52435           
=======================================
  Hits        49982    49982           
  Misses       2453     2453           

Flag	Coverage Δ
behaviourtests	4.16% <ø> (ø)
unittests	95.93% <ø> (ø)

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[coveralls]

Pull Request Test Coverage Report for Build 7173614789

Warning: This coverage report may be inaccurate.

We've detected an issue with your CI configuration that might affect the accuracy of this pull request's coverage report.
To ensure accuracy in future PRs, please see these guidelines.
A quick fix for this PR: rebase it; your next report should be accurate.

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 95.886%

---

Totals
Change from base Build 7170941492:	0.0%
Covered Lines:	50108
Relevant Lines:	52258

---

💛 - Coveralls

[pnuu]

LGTM