Accept Repository Invitation

This API operation allows an authenticated user to accept a pending repository invitation by sending a PATCH request to the `/user/repository_invitations/{invitation_id}` endpoint, where `{invitation_id}` is the unique identifier of the invitation to be accepted. When invoked, it processes the invitation and grants the user access to the specified repository with the permissions defined in the invitation. This is commonly used when a repository owner or administrator has invited a user to col...