Python version support: sync verified and advertised versions

There are differences with regards to the versions of Python that are
verified (somehow) through Pylint, and the ones that are advertised.

Given that there's no pinning of Pylint versions, it shouldn't be
possible to use it on Python versions such as 3.5 and 3.6 (latest
Pylint doesn't support those).  With that, let's cover all the
currently supported Python versions.

Signed-off-by: Cleber Rosa <crosa@redhat.com>

.github/workflows/pylint.yml

@@ -22,7 +22,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.8", "3.9", "3.10"]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
     steps:
     - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python-version }}

setup.py

@@ -16,12 +16,11 @@ setup(
     classifiers=[
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.5",
-        "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
+        "Programming Language :: Python :: 3.11",
         "Intended Audience :: Developers",
         "Operating System :: OS Independent",
         "Development Status :: 3 - Alpha",