chg: dev: remove old py version from coverage workflow and tox config

Signed-off-by: Stephen L Arnold <nerdboy@gentoo.org>

.github/workflows/coverage.yml

@@ -129,7 +129,7 @@ jobs:
       coverage-rounded-display: ${{ steps.coverage.outputs.coverage-rounded-display }}
     env:
       PLATFORM: ubuntu-20.04
-      PYTHON: '3.12'
+      PYTHON: '3.11'
       PYTHONIOENCODING: utf-8
       PIP_DOWNLOAD_CACHE: ${{ github.workspace }}/../.pip_download_cache
 
@@ -147,15 +147,9 @@ jobs:
         python -m pip install --upgrade pip
         pip install tox
 
-    - name: Setup old python for test
-      uses: actions/setup-python@v5
-      with:
-        python-version: '3.6.15'
-        # this requires going back to focal for 3.6
-
     - name: Generate coverage
       run: |
-        tox -e coverage,py36,py312
+        tox -e py,coverage
 
     - name: Code Coverage Summary Report (data)
       uses: irongut/CodeCoverageSummary@v1.3.0

tox.ini

@@ -1,12 +1,11 @@
 [tox]
-envlist = py3{6,8,9,10,11,12}-{linux,macos,windows},coverage
+envlist = py3{8,9,10,11,12}-{linux,macos,windows},coverage
 skip_missing_interpreters = true
 isolated_build = true
 skipsdist = true
 
 [gh-actions]
 python =
-    3.6: py36
     3.8: py38
     3.9: py39
     3.10: py310
@@ -81,7 +80,6 @@ commands =
     coverage xml
 
 depends =
-    py36
     py38
     py39
     py310