drop support for Python 3.5

As all currently supported distros provide at least python 3.6, we
drop the support for 3.5. At time of this commit, the python versions
of the supported distros are as following:

- Debian: 3.7 (buster)
- Ubuntu: 3.7 (18.04)
- Fedora: 3.11 (Fedora 36)
- RHEL: 2.x (RHEL 7), 3.6 (RHEL 8)
- OpenSUSE: 3.6 (Leap / 15.4)

While updating the lower bound version, we also unify the upper bound in
the setup.py script with the versions tested in the CI.

Signed-off-by: Felix Moessbauer <felix.moessbauer@siemens.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

.github/workflows/next.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        python-version: ["3.5", "3.6", "3.7", "3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10", "3.11"]
     steps:
       - name: Check out repo
         uses: actions/checkout@v3

setup.py

@@ -70,11 +70,12 @@ setup(
         'License :: OSI Approved :: MIT License',
 
         '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',
     ],
     keywords='OpenEmbedded bitbake development',
 
@@ -95,6 +96,6 @@ setup(
         'kconfiglib>=14.1.0,<15',
     ],
 
-    # At least python 3.5 is needed by now for PyYAML:
-    python_requires='>=3.5',
+    # At least python 3.6 is needed by now:
+    python_requires='>=3.6',
 )