Workflow for closing Old PRs

[Asymtode712]

Please describe your feature.
This feature aims to automate the management of open PRs in a repository, ensuring that outdated or abandoned PRs are closed in a timely manner.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.

Describe the solution you'd like
Implement a workflow that automatically closes old PRs based on predefined criteria, such as their last update timestamp. By regularly closing PRs that have not been updated within a certain timeframe, the repository can stay organized, and contributors can focus on active and relevant PRs.

[Asymtode712]

@dhruvpatidar359 please assign me this issue under gssoc'24