Fix voucher validation when discount type is shipping

[poulch]

Scope of the change

[changeset-bot]

🦋 Changeset detected

Latest commit: 158bb2a

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
saleor-dashboard	Patch

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[codecov]

Codecov Report

Attention: Patch coverage is 76.92308% with 3 lines in your changes missing coverage. Please review.

Project coverage is 62.34%. Comparing base (5e62013) to head (158bb2a).

Files with missing lines	Patch %	Lines
src/discounts/handlers.ts	75.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5441      +/-   ##
==========================================
+ Coverage   62.32%   62.34%   +0.02%     
==========================================
  Files        1271     1271              
  Lines       22092    22098       +6     
  Branches     4616     4617       +1     
==========================================
+ Hits        13768    13778      +10     
+ Misses       8285     8281       -4     
  Partials       39       39              

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