Update two IRS files and rename WIDOW to SURVIVING_SPOUSE

[rickecon]

• make format and make documentation has been run. (You may also want to run make test.)

This PR:

• Updates IRS rate threshholds and standard deduction amounts in parameters.gov.irs.income.bracket.yaml and in parameters.gov.irs.deductions.standard.amount.yaml
• Renames WIDOW filer type to SURVIVING_SPOUSE

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.44%. Comparing base (bf28953) to head (73b720b).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #83   +/-   ##
=======================================
  Coverage   98.44%   98.44%           
=======================================
  Files        1840     1840           
  Lines       27088    27088           
  Branches      142      142           
=======================================
  Hits        26667    26667           
  Misses        390      390           
  Partials       31       31           

Flag	Coverage Δ
unittests	98.44% <100.00%> (ø)

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