feat: Update minimum supported macOS version to match Swift SDK

[harsh62]

Issue #

Update the minimum supported macOS version to match the AWS SDK for Swift.

Description

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 67.55%. Comparing base (e3d6f63) to head (2856e5a).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4025      +/-   ##
==========================================
+ Coverage   67.51%   67.55%   +0.03%     
==========================================
  Files        1130     1130              
  Lines       52639    52639              
==========================================
+ Hits        35539    35560      +21     
+ Misses      17100    17079      -21     

Flag	Coverage Δ
API_plugin_unit_test	70.33% <ø> (-0.03%)	⬇️
AWSPluginsCore	69.26% <ø> (ø)
Amplify	47.84% <ø> (+0.02%)	⬆️
Analytics_plugin_unit_test	85.20% <ø> (ø)
Auth_plugin_unit_test	73.64% <100.00%> (+0.08%)	⬆️
DataStore_plugin_unit_test	83.38% <ø> (+0.06%)	⬆️
Geo_plugin_unit_test	74.86% <ø> (ø)
Logging_plugin_unit_test	63.53% <100.00%> (ø)
Predictions_plugin_unit_test	34.77% <ø> (ø)
PushNotifications_plugin_unit_test	88.43% <ø> (ø)
Storage_plugin_unit_test	76.87% <100.00%> (ø)
unit_tests	67.55% <100.00%> (+0.03%)	⬆️

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