Recently GitHub updated their RSA SSH host key so you might be having an error while pushing changes as shown in the below image
This can be fixed by running following commands:
ssh-keygen -R github.com
curl -L https://api.github.com/meta | jq -r '.ssh_keys | .[]' | sed -e 's/^/github.com /' >> ~/.ssh/known_hosts
Full details can be found here: https://github.blog/2023-03-23-we-updated-our-rsa-ssh-host-key/