Update conda to use Python 3.12, drop 3.9 and 3.10

.github/workflows/ci-conda.yml

@@ -26,23 +26,12 @@ jobs:
         # On pushes to tags or branches, test the whole matrix.
         os: >-
           ${{ github.event_name == 'pull_request'
-                && fromJson('["ubuntu-latest"]')
+                && fromJson('["ubuntu-latest", "macos-latest"]')
                 || fromJson('["ubuntu-latest", "macos-latest", "macos-13"]') }}
-        python: >-
-          ${{ github.event_name == 'pull_request'
-                && fromJson('["3.9"]')
-                || fromJson('["3.9", "3.10", "3.11"]') }}
+        python: ['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 (arm64) with Python 3.11.
-        # Build & Test currently uses Python 3.10 (on ubuntu-jammy).
-        # Together, they cover the supported minor Python versions.
-        include: >-
-          ${{ github.event_name == 'pull_request'
-                && fromJson('[{"os": "macos-latest", "python": "3.11", "conda-env": "environment"}]')
-                || fromJson('[]') }}
 
     steps:
       - uses: actions/checkout@v4

.github/workflows/ci-meson.yml

@@ -23,7 +23,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu]
-        python: ['3.9', '3.10', '3.11']
+        python: ['3.11', '3.12']
 
     steps:
       - uses: actions/checkout@v4

.gitignore

@@ -26,13 +26,11 @@
 # no longer generated, but may still be in user worktrees
 /src/lib/pkgconfig
 
-# Conda environment files
-# The files without Python version, with -dev or in src are no longer generated
-# but may still be in users' directories.
+# Conda environment files (auto-generated)
+/environment-3.[0-9].yml
+/environment-3.[0-9][0-9].yml
+# The following files are no longer generated but may still be in users' directories
 /environment.yml
-/environment-3.9.yml
-/environment-3.10.yml
-/environment-3.11.yml
 /environment-dev-3.9.yml
 /environment-dev-3.10.yml
 /environment-dev-3.11.yml