@MayAnnTenorio You don’t necessarily need to update the Pega Robotics Runtime version or change you deployment package. You can update the Pega Native Foundation (PNF) to the latest version independent of Pega Robotics Runtime.
You will need to download the latest Pega Robotics Runtime from Digital Delivery to get the installer for PNF however. You can install the independently though and it will work fine with 19.1.43.
Windows build 21H1 is supported in the latest PNF. The link above describes the naming of the version for PNF better than I can.