add new dimensions for ipad 11" screenshots support

[ctruong90]

Checklist

• I've run bundle exec rspec from the root directory to see all new and existing tests pass
• I've followed the fastlane code style and run bundle exec rubocop -a to ensure the code style is valid
• I see several green ci/circleci builds in the "All checks have passed" section of my PR (connect CircleCI to GitHub if not)
• I've read the Contribution Guidelines
• I've updated the documentation if necessary.
• I've added or updated relevant unit tests.

Motivation and Context

This change was necessary for to add support to dimensions of screenshots that are supported by Apple appstore connect for ipad 11' screenshots

Resolves #21764

Description

I was running into errors:

US/SCREENSHOTS_IPAD_0.png - Invalid screen size (Actual size is 2360x1640 See the specifications to fix
[https://help.apple.com/app-store-connect/#/devd274dd925)�[0m|https://help.apple.com/app-store-connect/#/devd274dd925)%1B[0m]

According to https://developer.apple.com/help/app-store-connect/reference/screenshot-specifications/, the screen size "2360x1640" is actually supported by Apple but currently not being supported with fastlane. So I updated deliver/lib/deliver/app_screenshot.rb to include the supported dimensions that are missing.