test: use macos-13 runners for stress tests and use explicit iOS version

[atierian]

Description

Stress tests are failing because they're still running on macos-12 runners that don't have Xcode 14.3, which added the fulfillment(of:) API.

• Updates stress tests to run on macos-13

It looks like tests are taking longer when using OS=latest for iOS test runs. Using an explicit version sped up the PushNotifications integration tests dramatically.

• Specifies exact iOS version in integration tests (OS=16.4)

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-commenter]

Codecov Report

Merging #3310 (0703240) into main (aef39fd) will increase coverage by 0.19%.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##             main    #3310      +/-   ##
==========================================
+ Coverage   64.31%   64.51%   +0.19%     
==========================================
  Files        1075     1075              
  Lines       35887    35887              
==========================================
+ Hits        23080    23151      +71     
+ Misses      12807    12736      -71     

Flag	Coverage Δ
API_plugin_unit_test	67.07% <ø> (ø)
AWSPluginsCore	66.15% <ø> (ø)
Amplify	47.84% <ø> (ø)
Analytics_plugin_unit_test	81.37% <ø> (ø)
Auth_plugin_unit_test	74.10% <ø> (+0.01%)	⬆️
CoreMLPredictions_plugin_unit_test	59.44% <ø> (ø)
DataStore_plugin_unit_test	81.13% <ø> (+1.05%)	⬆️
Geo_plugin_unit_test	70.75% <ø> (ø)
Logging_plugin_unit_test	63.09% <ø> (ø)
Predictions_plugin_unit_test	37.29% <ø> (ø)
PushNotifications_plugin_unit_test	60.29% <ø> (ø)
Storage_plugin_unit_test	54.18% <ø> (ø)
unit_tests	64.51% <ø> (+0.19%)	⬆️

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see 13 files with indirect coverage changes

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