feat!: bump app template's default ios minimum to 14.0

[erisu]

Platforms affected

ios

Motivation and Context

force apps minimum iOS support to 14.0

Description

bump IPHONEOS_DEPLOYMENT_TARGET & default deployment-target setting to 14.0

Testing

• npm t
• cordova platform add
• cordova build ios
• Run from Xcode & Launch on Simulator

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• I've updated the documentation if necessary

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.35%. Comparing base (df4b8a6) to head (5d828cd).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1427   +/-   ##
=======================================
  Coverage   78.35%   78.35%           
=======================================
  Files          16       16           
  Lines        1825     1825           
=======================================
  Hits         1430     1430           
  Misses        395      395           

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