Mark nonmutating to Attribute wrappedValue setter

[Kyle-Ye]

Close #58

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 18.23%. Comparing base (0217e1d) to head (0c3b73d).

Files	Patch %	Lines
...rces/OpenGraph/Attribute/Attribute/Attribute.swift	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #59   +/-   ##
=======================================
  Coverage   18.23%   18.23%           
=======================================
  Files          49       49           
  Lines        1223     1223           
=======================================
  Hits          223      223           
  Misses       1000     1000           

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