fix: CodeRabbit auto-fixes for PR #474

[coderabbitai]

This stacked PR contains CodeRabbit auto-fixes for #474.

Files modified:

• src/Redmine/Api/CustomField.php
• src/Redmine/Api/Search.php
• src/Redmine/Serializer/XmlSerializer.php

[coderabbitai]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.72%. Comparing base (ec15698) to head (28c349a).
⚠️ Report is 1 commits behind head on 464-strict-types.

Additional details and impacted files

@@                 Coverage Diff                 @@
##             464-strict-types     #475   +/-   ##
===================================================
  Coverage               98.72%   98.72%           
  Complexity                783      783           
===================================================
  Files                      29       29           
  Lines                    2275     2275           
===================================================
  Hits                     2246     2246           
  Misses                     29       29           

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[Art4]

Closed by commit 47748bd