setup: Update the minimum required runtime python3 version

Related to T2367

setup.py

@@ -49,6 +49,7 @@ setup(
                 'monitoring',
     long_description=long_description,
     long_description_content_type='text/markdown',
+    python_requires=">=3.7",
     author='Software Heritage developers',
     author_email='swh-devel@inria.fr',
     url='https://forge.softwareheritage.org/diffusion/swh-icinga-plugins',

[Phabricator Migration user]

Some references in the commit message have been migrated:

• T2367 is now swh-core#2367 (closed)