Make use of std::to_underlying when we have C++23

[jwillemsen]

* ridlbe/c++11/templates/cli/src/bitmask_cdr.erb:
* ridlbe/c++11/templates/cli/src/enum_cdr.erb:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.80%. Comparing base (09fbeb6) to head (8b7b1f3).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #394      +/-   ##
==========================================
- Coverage   59.80%   59.80%   -0.01%     
==========================================
  Files         597      597              
  Lines       47588    47586       -2     
  Branches     4215     4212       -3     
==========================================
- Hits        28462    28460       -2     
  Misses      16006    16006              
  Partials     3120     3120              

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