Change grouped_matcher syntax to use | instead.

[Swoorup]

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[codecov]

Codecov Report

Attention: Patch coverage is 68.42105% with 6 lines in your changes missing coverage. Please review.

Project coverage is 85.88%. Comparing base (8446f3c) to head (4e2eae6).

Files with missing lines	Patch %	Lines
dtype_variant_derive/src/grouped_matcher.rs	68.43%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #23      +/-   ##
==========================================
+ Coverage   85.73%   85.88%   +0.16%     
==========================================
  Files           5        5              
  Lines        1205     1211       +6     
==========================================
+ Hits         1033     1040       +7     
+ Misses        172      171       -1     

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