@SaptakS the repository is locked. Force push shouldn't be possible. Perhaps @mariobehling you could check the Github organization audit logs to see if anyone recently unlocked the repo. (I'm not sure if that info is part of the logs)
@aditya1702 There was not any info in your issue, no screenshot or description in your PR and you merged it yourself without peer-review. After working together for over two months full-time on this project it is sad to see, that you are still not following our workflow.
@aditya1702 Please provide the required info and make a new PR, that can be peer-reviewed.