fix(ci): update greetings workflow inputs to snake_case for first-interaction@v3

[santusht06]

Summary [required]

Fixes a bug in .github/workflows/greetings.yml where actions/first-interaction@v3 was failing on every new issue and pull request with the error:

Unexpected input(s) 'repo-token', 'issue-message', 'pr-message', valid inputs are ['issue_message', 'pr_message', 'repo_token']

This PR changes the inputs from kebab-case (repo-token, issue-message, pr-message) to snake_case (repo_token, issue_message, pr_message).

Related Issue [required]

Closes #N/A (CI fix)

Type of Change [required]

• Bug fix — resolves a broken behaviour
• Feature — adds new functionality
• Data — adds new projects to data/projects.json
• Documentation — updates docs, README, or code comments only
• Style — CSS or visual changes only, no logic change
• Refactor — restructures code without changing behaviour
• Test — adds or updates tests

What Was Changed [required]

File	Change made
.github/workflows/greetings.yml	Corrected input names to repo_token, issue_message, and pr_message to match actions/first-interaction@v3 specification.

How to Test This PR [required]

1. Inspect .github/workflows/greetings.yml
2. Verify input names match actions/first-interaction@v3 specification: repo_token, issue_message, pr_message.

Self-Review Checklist [required]

• I have read CONTRIBUTING.md and followed all guidelines
• My branch name follows the convention: fix/
• I have not modified files outside the scope of this fix

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