chore: Add note about Semver implications for dependency updates

[mattcreaser]

Issue #

Description

Adds a note to the readme about semver implications for dependency updates. This aligns with Android and Flutter.

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

[mattcreaser]

Please point out if there are any Swift-specific dependencies are are particularly relevant to this item (ie Kotlin language version for Android).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.40%. Comparing base (ad53816) to head (6390a63).
Report is 4 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #3740       +/-   ##
===========================================
+ Coverage   68.42%   79.40%   +10.98%     
===========================================
  Files        1079      288      -791     
  Lines       37563    10309    -27254     
===========================================
- Hits        25701     8186    -17515     
+ Misses      11862     2123     -9739     

Flag	Coverage Δ
API_plugin_unit_test	?
AWSPluginsCore	?
Amplify	?
Analytics_plugin_unit_test	?
Auth_plugin_unit_test	79.40% <ø> (+0.07%)	⬆️
DataStore_plugin_unit_test	?
Geo_plugin_unit_test	?
Logging_plugin_unit_test	?
Predictions_plugin_unit_test	?
PushNotifications_plugin_unit_test	?
Storage_plugin_unit_test	?
unit_tests	79.40% <ø> (+10.98%)	⬆️

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