ci: handle minimum python on runner images

Author: scivision

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
     name: ${{ matrix.os }} Python ${{ matrix.python-version }}
     strategy:
       matrix:
-        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12', '3.13']
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
         os: [ubuntu-latest]
         include:
         - os: macos-latest

.github/workflows/ci_stdlib_only.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       matrix:
         python-version: ['3.8', '3.9', '3.10', '3.11', '3.12', '3.13']
-        os: ['ubuntu-latest']
+        os: ['ubuntu-22.04']
         include:
         - os: macos-latest
           python-version: '3.13'