chore!: Bump CordovaLib requirements to iOS 13+

[dpogue]

Platforms affected

iOS

Motivation and Context

We already bumped the app template to a minimum of iOS 13 to support UISceneDelegates, and it turns out iOS 13 is the first version where WKURLSchemeTask is properly thread-safe, so we might as well bump CordovaLib and silence that warning that people keep complaining about 🥲

Description

Bump the minimum iOS target for CordovaLib to 13.0, and update tests/project files to match.

Closes #1427.

Testing

All existing tests pass, no warnings in Xcode.

Checklist

• I've run the tests to see all new and existing tests pass

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.22%. Comparing base (458f5f3) to head (58afe74).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1480   +/-   ##
=======================================
  Coverage   80.22%   80.22%           
=======================================
  Files          16       16           
  Lines        1871     1871           
=======================================
  Hits         1501     1501           
  Misses        370      370           

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