[eas-json] add Xcode 15.3 image

[szdziedzic]

Why

Add Xcode 15.3 image

How

Add Xcode 15.3 image

[szdziedzic]

/changelog-entry chore Add info about the Xcode 15.3 image to eas.schema.json

[github-actions]

✅ Thank you for adding the changelog entry!

[github-actions]

Size Change: -162 B (0%)

Total Size: 51.4 MB

Filename	Size	Change
./packages/eas-cli/dist/eas-linux-x64.tar.gz	51.4 MB	-162 B (0%)

_{compressed-size-action}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.67%. Comparing base (b52145c) to head (5468282).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2312   +/-   ##
=======================================
  Coverage   53.67%   53.67%           
=======================================
  Files         525      525           
  Lines       19160    19160           
  Branches     4043     4043           
=======================================
  Hits        10282    10282           
  Misses       8152     8152           
  Partials      726      726           

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