What are you referring to? The only thing rclone does is connect to the remote based on the TLS libraries with rclone. Whatever your internal team did to any systems or servers wouldn't really matter.
The only thing that would matter is if AWS S3 changed something and rclone didn't support it.
Hopefully you mean TLSv1.0 to TLSv1.2 as I don't think TLSv2.0 exists yet. Rclone will support TLSv1.2 just fine. (If you meant SSLv2.0 then rclone won't suppor that as it is considered obsolete and insecure)