Update setup.py to restrict python version >= 3.9 (#1725)

* Update setup.py

Release 0.17.0 is incompatible with Python < 3.8

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

* Update setup.py

Author: pgValero

setup.py

@@ -155,6 +155,7 @@ def get_package_version():
     maintainer='Tom Kralidis',
     maintainer_email='[email protected]',
     url='https://pygeoapi.io',
+    python_requires='>=3.10',
     install_requires=read('requirements.txt').splitlines(),
     packages=find_packages(exclude=['pygeoapi.tests']),
     include_package_data=True,