Added workflow for closing old PRs

[Asymtode712]

PR Description

This feature aims to automate the management of open PRs in a repository, ensuring that outdated or abandoned PRs are closed in a timely manner. By doing so, it helps maintain repository hygiene, improves workflow efficiency, and provides a better experience for both maintainers and contributors.

Related Issues: Issue for which you are raising a PR for

• Closes 💡[FEATURE]: Workflow for Closing Old PRs #183

Issue

Issue no. #183

Checklist

• I have gone through the contributing guide
• I have updated my branch and synced it with project main branch before making this PR
• Is this a bug fix/enhancement/documentation changes

Undertaking

I declare that:

1. The content I am submitting is original and has not been plagiarized.
2. No portion of the work has been copied from any other source without proper attribution.
3. The work has been checked for plagiarism, and I assure its authenticity.

• I have updated my branch and synced it with project main branch before making this PR
• Is this a bug fix/enhancement/documentation changes
• Part of GSSOC
• Tested for any breaking changes
• Other relevant checks completed

I understand that any violation of this undertaking may have legal consequences that I will bear and could result in the withdrawal of any recognition associated with the work.

• I Agree

[Anishkagupta004]

Thankyou for your contribution

[Asymtode712]

@varshith257 @Anishkagupta04 Can you please add the 'gssoc' and revelant level labels