software: drop support for Python 3.8.

Even Debian oldstable has Python 3.9 now.

.github/workflows/main.yml

@@ -12,12 +12,11 @@ jobs:
     strategy:
       matrix:
         python-version:
-        - '3.8'
         - '3.9'
         - '3.10'
         - '3.11'
-        - 'pypy-3.8'
         - 'pypy-3.9'
+        - 'pypy-3.10'
         allow-failure:
         - false
         include:

software/glasgow/support/plugin.py

@@ -10,7 +10,7 @@
 
 # There are subtle differences between Python versions for both importlib.metadata (the built-in
 # package) and importlib_metadata (the PyPI installable shim), so implement this function the way
-# we need ourselves based on the Python 3.8 API. Once we drop Python 3.9 support this abomination
+# we need ourselves based on the Python 3.9 API. Once we drop Python 3.9 support this abomination
 # can be removed.
 def _entry_points(*, group, name=None):
     for distribution in importlib.metadata.distributions():

software/pyproject.toml

@@ -15,7 +15,7 @@ classifiers = [
   "Topic :: System :: Hardware",
 ]
 
-requires-python = "~=3.8"
+requires-python = "~=3.9"
 dependencies = [
   "packaging>=23",
   "appdirs~=1.4",