Update setup.py to restrict python version >= 3.9

[pgValero]

Release 0.17.0 is incompatible with Python < 3.8

"python_requires" added to only install this version with python >= 3.9

Overview

Related Issue / discussion

I with python 3.8 the lastest version (0.17.0) is install but it's incompatible. Restrict this to install v0.16.1 is python < 3.9.

Additional information

Dependency policy (RFC2)

• I have ensured that this PR meets RFC2 requirements

Updates to public demo

• I have ensured that breaking changes to the pygeoapi master demo server have been addressed
  • https://github.com/geopython/demo.pygeoapi.io/blob/master/services/pygeoapi_master/local.config.yml

Contributions and licensing

(as per https://github.com/geopython/pygeoapi/blob/master/CONTRIBUTING.md#contributions-and-licensing)

• I'd like to contribute [feature X|bugfix Y|docs|something else] to pygeoapi. I confirm that my contributions to pygeoapi will be compatible with the pygeoapi license guidelines at the time of contribution
• I have already previously agreed to the pygeoapi Contributions and Licensing Guidelines

[ricardogsilva]

Hi @pgValero

Thanks for this, indeed we missed updating setup.py with the correct information. However, as mentioned in #1543, and subsequently merged in #1586 our target version of Python is 3.10 and not 3.9. Can you please update your PR to mention 3.10 instead?

[pgValero]

Hi @ricardogsilva

Perfect, thanks!