chore: update readme with correct Xcode version for visionOS

[harsh62]

Issue #

Description

The aim of the PR is to fix the minimum supported version of Xcode in Amplify Swift.

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 68.44%. Comparing base (9ed6c1c) to head (0f8ddea).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3761      +/-   ##
==========================================
+ Coverage   68.43%   68.44%   +0.01%     
==========================================
  Files        1079     1079              
  Lines       37573    37573              
==========================================
+ Hits        25712    25718       +6     
+ Misses      11861    11855       -6     

Flag	Coverage Δ
API_plugin_unit_test	68.83% <ø> (ø)
AWSPluginsCore	68.56% <ø> (+0.14%)	⬆️
Amplify	47.60% <ø> (-0.05%)	⬇️
Analytics_plugin_unit_test	84.52% <ø> (ø)
Auth_plugin_unit_test	79.41% <ø> (+0.04%)	⬆️
DataStore_plugin_unit_test	81.30% <ø> (+0.01%)	⬆️
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	68.44% <ø> (+0.01%)	⬆️

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