High Python versions should not be compatible with very old RDT versions

[npatki]

Description

If I am on a high, unsupported version of Python (such as 3.11 or 3.12), the pip resolver thinks that very old versions of RDT (such as 0.2.1) are compatible with my environment. It installs them -- and the code doesn't work.

The root cause: For RDT version 0.2.1 and before, the Python requirements is >=3.5, with no upper limit. After version 0.2.1, the Python requirement has an upper limit such as >=3.5, <3.8, which gets updated.

Expected Update

I expect that I should not be allowed to install incompatible RDT packages. There are many solutions to this including:

• Yanking older versions, see PEP 592
• Modifying older versions

Note: Once we add support for new versions of Python, pip would no longer need to reach this far back into history to find an older version. Another solution can be to make sure we support all newer versions of Python.