changed Muir to muir

[shimwell]

OpenMc 0.13.3 is nearly out and the Muir has ben replaced with muir as described in issue #71

[codecov]

Codecov Report

Merging #79 (ed2b47a) into main (cd00546) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #79   +/-   ##
=======================================
  Coverage   96.29%   96.29%           
=======================================
  Files           7        7           
  Lines         216      216           
=======================================
  Hits          208      208           
  Misses          8        8           

Impacted Files	Coverage Δ
openmc_plasma_source/point_source.py	100.00% <100.00%> (ø)
openmc_plasma_source/ring_source.py	100.00% <100.00%> (ø)
openmc_plasma_source/tokamak_source.py	97.19% <100.00%> (ø)

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[shimwell]

tests are passing, I think this is ready to merge, but might want to wait for the conda release of openmc

[shimwell]

openmc 0.13.3 is released on conda, so I think this is ready to merge. Let me know if you have any objections @RemDelaporteMathurin

if not I shall merge in next week

[RemDelaporteMathurin]

@shimwell no objections!