Degenerate heat capacity matrix

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[codecov]

Codecov Report

❌ Patch coverage is 97.64706% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.52%. Comparing base (0e3e943) to head (4027b22).
⚠️ Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
phono3py/phonon4/frequency_shift.py	93.54%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #596      +/-   ##
==========================================
- Coverage   78.57%   78.52%   -0.06%     
==========================================
  Files         122      122              
  Lines       19377    19400      +23     
==========================================
+ Hits        15226    15234       +8     
- Misses       4151     4166      +15     

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