chore: add @mainactor attribute to DeviceInfo

[phantumcode]

Issue #

Description

UIDevice is marked with @MainActor attribute resulting in errors when calling it from synchronous non-isolated context.
Resolve strict concurrency error by updating DeviceInfo and calling UIDevice from main-actor isolated context.

This results in changes in AWSCognitoAuthPlugin and InternalAWSPinpoint so that calls to DeviceInfo is executed in an async context.

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

Attention: Patch coverage is 92.79279% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 72.69%. Comparing base (d71438a) to head (9a2ff17).

Files	Patch %	Lines
...Plugin/AWSCloudWatchLoggingSessionController.swift	63.63%	4 Missing ⚠️
...Storage/AWSS3StorageService+DownloadBehavior.swift	0.00%	3 Missing ⚠️
...AuthPlugin/Support/Utils/SignUpInput+Amplify.swift	97.05%	1 Missing ⚠️

Additional details and impacted files

@@                      Coverage Diff                      @@
##           enhancement/swift6_update    #3712      +/-   ##
=============================================================
+ Coverage                      68.37%   72.69%   +4.31%     
=============================================================
  Files                           1089      732     -357     
  Lines                          37653    31115    -6538     
=============================================================
- Hits                           25747    22620    -3127     
+ Misses                         11906     8495    -3411     

Flag	Coverage Δ
API_plugin_unit_test	68.97% <ø> (+0.21%)	⬆️
AWSPluginsCore	65.81% <ø> (ø)
Amplify	?
Analytics_plugin_unit_test	84.52% <ø> (ø)
Auth_plugin_unit_test	79.40% <98.63%> (+0.04%)	⬆️
DataStore_plugin_unit_test	81.39% <ø> (+0.08%)	⬆️
Geo_plugin_unit_test	72.00% <ø> (ø)
Logging_plugin_unit_test	62.91% <85.18%> (+0.06%)	⬆️
Predictions_plugin_unit_test	37.32% <ø> (ø)
PushNotifications_plugin_unit_test	86.21% <ø> (ø)
Storage_plugin_unit_test	76.75% <72.72%> (+<0.01%)	⬆️
unit_tests	72.69% <92.79%> (+4.31%)	⬆️

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