chore: resolve build failure in Amplify Core unit test for Xcode 16 beta 2

[phantumcode]

Issue #

Description

Resolving compile error in Amplify Core unit tests when building with Xcode 16 beta 2.

General Checklist

• Added new tests to cover change, if needed
• Build succeeds with all target using Swift Package Manager
• All unit tests pass
• All integration tests pass
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)
• Documentation update for the change if required
• PR title conforms to conventional commit style
• New or updated tests include Given When Then inline code documentation and are named accordingly testThing_condition_expectation()
• If breaking change, documentation/changelog update with migration instructions

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.46%. Comparing base (6f65406) to head (2a76236).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3768      +/-   ##
==========================================
- Coverage   68.47%   68.46%   -0.02%     
==========================================
  Files        1079     1079              
  Lines       37571    37571              
==========================================
- Hits        25726    25722       -4     
- Misses      11845    11849       +4     

Flag	Coverage Δ
API_plugin_unit_test	68.83% <ø> (-0.04%)	⬇️
AWSPluginsCore	68.56% <ø> (ø)
Amplify	47.59% <ø> (-0.07%)	⬇️
Analytics_plugin_unit_test	84.52% <ø> (ø)
Auth_plugin_unit_test	79.48% <ø> (+<0.01%)	⬆️
DataStore_plugin_unit_test	81.29% <ø> (ø)
Geo_plugin_unit_test	72.00% <ø> (ø)
Logging_plugin_unit_test	62.95% <ø> (ø)
Predictions_plugin_unit_test	37.32% <ø> (ø)
PushNotifications_plugin_unit_test	86.21% <ø> (ø)
Storage_plugin_unit_test	76.75% <ø> (ø)
unit_tests	68.46% <ø> (-0.02%)	⬇️

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