Add inline comment denoting version for Ruby setup

[Jayanth-Parthsarathy]

What?

Add version number as comment for ruby setup in rnmobile-ios-runner.yml

Why?

Fixes #59624. This PR adds a human-readable comment denoting the version number for the Ruby setup in the rnmobile-ios-runner.yml file. This enhances readability and helps maintain consistency with GitHub security hardening guidelines.

How?

The PR adds an inline comment following the recommendation outlined in GitHub security hardening guidelines. This comment provides clarity on the version of Ruby being used in the workflow setup.

Testing Instructions

1. Navigate to the rnmobile-ios-runner.yml file.
2. Locate the Ruby setup step.
3. Verify that a comment denoting the version number is present.

Testing Instructions for Keyboard

N/A

Screenshots or screencast

[github-actions]

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Co-authored-by: Jayanth-Parthsarathy <jayanthparthsarathy@git.wordpress.org>
Co-authored-by: desrosj <desrosj@git.wordpress.org>

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[github-actions]

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[desrosj]

Thanks @Jayanth-Parthsarathy

[desrosj]

Before merging this @Jayanth-Parthsarathy, could you create a w.org account and link your GitHub profile to it? The details how to do that are here.

[Jayanth-Parthsarathy]

I have linked my wordpress account to my github account @desrosj .

[Jayanth-Parthsarathy]

Hey @desrosj any updates on this? Glad to make any changes if needed

[desrosj]

No changes needed. Sorry for the delay, I was traveling home after WordCamp Asia.