added workflow for closing old PRs

[Asymtode712]

PR Description

Add your description

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

• Closes #44

Issue

44

Checklist

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

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 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.

• [X] I Agree

[Asymtode712]

@aswinikalyan30 please review and merge this PR