CMake: Change Python version required to be at least 3.5 (#6081)
CMake: Change Python version required to be at least 3.5 (#6081)

Removed the restriction for the Python version to be >= 3.6 but < 3.8.
Now it has to be >=3.5, lower versions are EOL.

Removed the search for Python2 too since nothing uses it anymore.

Fixes osquery/osquery#6079
hackgnar/osquery,hackgnar/osquery,hackgnar/osquery