fix(eas-json): make language optional in IosSubmitProfile type

[byCedric]

Why

I'm running into this typing issue a lot, should be optional as it's not required.

How

• Made language optional in IosSubmitProfile

Test Plan

Typing issue only, see CI.

[github-actions]

Subscribed to pull request

File Patterns	Mentions
**/*	@douglowder

Generated by CodeMention

[github-actions]

✅ Thank you for adding the changelog entry!

[github-actions]

Size Change: -1.6 kB (0%)

Total Size: 54.6 MB

Filename	Size	Change
./packages/eas-cli/dist/eas-linux-x64.tar.gz	54.6 MB	-1.6 kB (0%)

_{compressed-size-action}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51.90%. Comparing base (0db5585) to head (e628488).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3225   +/-   ##
=======================================
  Coverage   51.90%   51.90%           
=======================================
  Files         620      620           
  Lines       25491    25491           
  Branches     5348     5348           
=======================================
  Hits        13229    13229           
  Misses      11166    11166           
  Partials     1096     1096           

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