Remove Python 3.8 support

Python 3.8 is no longer be part of tested runtimes since 2024.2 and is
reaching its EOL soon. Bump the minimum supported python version to
clean up the logic for Python 3.8 compatibility.

Also declare Python 3.12 support because now it's part of the tested
runtimes.

Change-Id: Iec518ada66b5891a50834b574a5ccbe0965e3933

releasenotes/notes/remove-py38-6eebcd268c6f8e37.yaml

@@ -0,0 +1,5 @@
+---
+upgrade:
+  - |
+    Support for Python 3.8 has been removed. Now the minimum python version
+    supported is 3.9 .

requirements.txt

@@ -10,4 +10,3 @@ pbr!=2.1.0,>=2.0.0 # Apache-2.0
 requests>=2.14.2 # Apache-2.0
 python-dateutil>=2.7.0 # BSD
 stevedore>=1.29.0 # Apache-2.0
-importlib_resources>=1.3; python_version<'3.9' # Apache-2.0

setup.cfg

@@ -6,7 +6,7 @@ description_file =
 author = OpenStack
 author_email = openstack-discuss@lists.openstack.org
 home_page = https://docs.openstack.org/sushy/latest/
-python_requires = >=3.8
+python_requires = >=3.9
 classifier =
     Environment :: OpenStack
     Intended Audience :: Information Technology
@@ -17,10 +17,10 @@ classifier =
     Programming Language :: Python :: Implementation :: CPython
     Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3.11
+    Programming Language :: Python :: 3.12
 
 [files]
 packages =

sushy/main.py

@@ -13,17 +13,10 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 import collections
+from importlib import resources
 import logging
 import os
 
-try:
-    from importlib import resources
-
-    if not hasattr(resources, "files"):
-        import importlib_resources as resources
-except ImportError:
-    import importlib_resources as resources
-
 import requests
 
 from sushy import auth as sushy_auth

sushy/resources/base.py

@@ -17,18 +17,12 @@ import abc
 import collections
 import copy
 import enum
+from importlib import resources
 import io
 import json
 import logging
 import zipfile
 
-try:
-    from importlib import resources
-    if not hasattr(resources, 'files'):
-        import importlib_resources as resources
-except ImportError:
-    import importlib_resources as resources
-
 from sushy import exceptions
 from sushy.resources import constants
 from sushy.resources import oem