Add some upcoming distro RIDs

Add some upcoming distro RIDs

This adds some RIDs that we know are current/upcoming:

- Fedora 33 is in development, and the version after this is most likely
  going to be Fedora 34. Adding this RID now, so we can get this RID in
  all current releases when it comes time to build on Fedora 34

- RHEL has generally committed to doing a major release every 3 years.
  With RHEL 8 released in 2019, RHEL 9 is under development. There's
  even a plan on how to create that from Fedora here:
  https://fedoraproject.org/wiki/Changes/ELN_Buildroot_and_Compose

- If there's a RHEL 9, there will most likely be an equivalent CentOS 9.
  Lets add that too.

- CentOS 7 has an aarch64 port. As does CentOS 8.