Replace Python 3.9 by 3.12 in Conda workflow

.github/workflows/ci-conda.yml

@@ -27,17 +27,11 @@ jobs:
           ${{ github.event_name == 'pull_request'
                 && fromJson('["ubuntu"]')
                 || fromJson('["ubuntu", "macos"]') }}
-        python: >-
-          ${{ github.event_name == 'pull_request'
-                && fromJson('["3.9"]')
-                || fromJson('["3.9", "3.10", "3.11"]') }}
+        python: ['3.10', '3.11', '3.12']
         # Optional environment is disabled for now as its not yet working
         # environment: [environment, environment-optional]
         conda-env: [environment]
-        # On pull requests, only test two jobs:
-        # Ubuntu with Python 3.9, macOS with Python 3.10.
-        # Build & Test currently uses Python 3.11 (on ubuntu-focal).
-        # Together, they cover the supported minor Python versions.
+        # On pull requests, only test one job on macos
         include: >-
           ${{ github.event_name == 'pull_request'
                 && fromJson('[{"os": "macos", "python": "3.10", "conda-env": "environment"}]')

bootstrap-conda

@@ -155,7 +155,7 @@ echo >&2 $0:$LINENO: generate conda environment files
     ) 4>> /dev/null 5>> src/environment-optional-template.yml
 
 for f in environment environment-optional src/environment src/environment-optional src/environment-dev; do
-    for python_version in 3.9 3.10 3.11; do
+    for python_version in 3.10 3.11 3.12; do
         sed -E 's/^( *- *)python *$/\1python='$python_version'/' $f-template.yml > $f-$python_version.yml
     done
     rm -f $f-template.yml