Alpine: Set default to 3.19 and remove Python 3.10

No prebuilt images for scipy==1.10.0 and Python 3.10, and while building it is possible, that would make the image bigger. Perhaps could be also be done in the build container later.

(Yes prebuilt images for scipy 1.11.0+ and supported Pythons)

.github/workflows/docker-publish-alpine.yml

@@ -15,7 +15,7 @@ jobs:
     secrets: inherit
     with:
       osname: 'alpine'
-      osstablever: '3.18'
-      pythonvers: '[ "3.10", "3.11" ]'
+      osstablever: '3.19'
+      pythonvers: '[ "3.11" ]'
       osvers: '[ "3.18", "3.19" ]'
       branch: '${{ github.event.inputs.branch }}'