Add 2023 CEPCI Value

[bpaul4]

Summary/Motivation:

Adds CEPCI value for 2023 based on latest information available at https://www.toweringskills.com/financial-analysis/cost-indices/.

Legal Acknowledgement

By contributing to this software project, I agree to the following terms and conditions for my contribution:

1. I agree my contributions are submitted under the license terms described in the LICENSE.txt file at the top level of this directory.
2. I represent I am authorized to make the contributions and grant the license. If my employer has rights to intellectual property that includes these contributions, I represent that I have received permission to make contributions and grant the required license on behalf of that employer.

[andrewlee94]

This looks OK, although it looks like the spell checker was updated again and has found more issues to be fixed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.35%. Comparing base (24ca931) to head (df34cdd).
Report is 24 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1447      +/-   ##
==========================================
- Coverage   76.36%   76.35%   -0.01%     
==========================================
  Files         394      394              
  Lines       64953    64953              
  Branches    14404    14404              
==========================================
- Hits        49601    49598       -3     
- Misses      12793    12797       +4     
+ Partials     2559     2558       -1     

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[adam-a-a]

LGTM