Drop support for Python 3.8.

Author: whitequark

.github/workflows/main.yml

@@ -12,12 +12,13 @@ jobs:
     strategy:
       matrix:
         python-version:
-        - '3.8'
         - '3.9'
         - '3.10'
         - '3.11'
-        - 'pypy-3.8'
+        - '3.12'
+        - '3.13'
         - 'pypy-3.9'
+        - 'pypy-3.10'
         # this version range needs to be synchronized with the one in pyproject.toml
         amaranth-version:
         - '0.4'

pyproject.toml

@@ -11,7 +11,7 @@ description = "Board and connector definitions for Amaranth HDL"
 authors = [{name = "Amaranth HDL contributors"}]
 license = {file = "LICENSE.txt"}
 
-requires-python = "~=3.8"
+requires-python = "~=3.9"
 dependencies = [
   # this version requirement needs to be synchronized with the one in .github/workflows/main.yml
   "amaranth>=0.4,<0.7",