fix(ci): align greetings workflow inputs with first-interaction@v3

[RecreationalMath]

What does this PR do?

The greetings workflow fails on every new issue/PR because actions/first-interaction@v3 renamed its inputs from kebab-case to snake_case. This PR updates the three input keys:

• repo-token -> repo_token
• issue-message -> issue_message
• pr-message -> pr_message

No message or behaviour changes. Example failing run: 24886149392 (triggered by opening #3364).

Before submitting

• (Not required, because typo PR) Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• (Not required) Did you make sure to update the docs?
• (Not required) Did you write any new necessary tests?

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in Github issues there's a high chance it will not be merged.

Did you have fun?

Oh yes, small kick of knowing no new contributor will get "[Lightning-AI/torchmetrics] Run failed: Greetings" as their welcome email anymore.

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📚 Documentation preview 📚: https://torchmetrics--3365.org.readthedocs.build/en/3365/

[RecreationalMath]

Heads-up: the two failing unittests.yml / Lit Job checks look unrelated to this PR. This PR only renames three input keys in .github/workflows/greetings.yml and doesn't touch any Python or test code.

[RecreationalMath]

@ethanwharris @justusschock could you please review this PR? Thanks!

[justusschock]

@RecreationalMath while on it, could we also pin the workflow sha?

[RecreationalMath]

@RecreationalMath while on it, could we also pin the workflow sha?

Done, pinned actions/first-interaction to 1c46889 (v3.1.0).

Heads up: this is currently the only SHA-pinned action in the repo, 41 other uses: references across 11 workflows + 2 composite actions are on mutable tags (19 actions/*, 6 Lightning-AI/utilities, 16 third-party). Happy to open a follow-up PR to pin them, scoped however you prefer (third-party only, or everything). Since the repo's Dependabot already covers github-actions, it would keep the pinned SHAs up to date, so pinning wouldn't introduce any staleness. Let me know what you'd like @justusschock

[justusschock]

@RecreationalMath if you want to do that it'd be much appreciated. It's definitely on our list todo for all workflows/actions

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 37%. Comparing base (d184220) to head (7957dd0).
⚠️ Report is 1 commits behind head on master.
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Additional details and impacted files

@@          Coverage Diff           @@
##           master   #3365   +/-   ##
======================================
  Coverage      37%     37%           
======================================
  Files         349     349           
  Lines       19901   19901           
======================================
  Hits         7264    7264           
  Misses      12637   12637           

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[RecreationalMath]

@RecreationalMath if you want to do that it'd be much appreciated. It's definitely on our list todo for all workflows/actions

Opened #3392 for this.