chore: Drop Python 3.9 support, advertise 3.14

Author: effigies

.github/workflows/test.yml

@@ -114,7 +114,6 @@ jobs:
       matrix:
         os: ['ubuntu-latest', 'windows-latest', 'macos-14', 'macos-latest']
         python-version:
-          - "3.9"
           - "3.10"
           - "3.11"
           - "3.12"
@@ -127,24 +126,22 @@ jobs:
         include:
           # Basic dependencies only
           - os: ubuntu-latest
-            python-version: "3.9"
+            python-version: "3.10"
             architecture: 'x64'
             dependencies: 'none'
           # Absolute minimum dependencies
           - os: ubuntu-latest
-            python-version: "3.9"
+            python-version: "3.10"
             architecture: 'x64'
             dependencies: 'min'
           # Absolute minimum dependencies
           - os: ubuntu-latest
-            python-version: "3.10"
+            python-version: "3.11"
             architecture: 'x64'
             dependencies: 'min'
         exclude:
           # Use ubuntu-latest to cover the whole range of Python. For Windows
           # and macOS, checking oldest and newest should be sufficient.
-          - os: windows-latest
-            python-version: "3.10"
           - os: windows-latest
             python-version: "3.11"
           - os: windows-latest
@@ -154,15 +151,13 @@ jobs:
           - os: windows-latest
             python-version: "3.13t"
           - os: macos-14
-            python-version: "3.9"
+            python-version: "3.11"
           - os: macos-14
-            python-version: "3.10"
+            python-version: "3.12"
           - os: macos-14
-            python-version: "3.14"
+            python-version: "3.13"
           - os: macos-14
-            python-version: "3.14t"
-          - os: macos-latest
-            python-version: "3.10"
+            python-version: "3.13t"
           - os: macos-latest
             python-version: "3.11"
           - os: macos-latest
@@ -171,6 +166,7 @@ jobs:
             python-version: "3.13"
           - os: macos-latest
             python-version: "3.13t"
+            python-version: "3.14t"
 
           ## Unavailable architectures
           # x86 is available for Windows
@@ -194,10 +190,10 @@ jobs:
           - os: macos-14
             dependencies: pre
           # Drop pre tests for SPEC-0-unsupported Python versions
-          - python-version: '3.9'
-            dependencies: pre
           - python-version: '3.10'
             dependencies: pre
+          - python-version: '3.11'
+            dependencies: pre
 
     env:
       DEPENDS: ${{ matrix.dependencies }}

pyproject.toml

@@ -27,6 +27,7 @@ classifiers = [
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
   "Programming Language :: Python :: 3.13",
+  "Programming Language :: Python :: 3.14",
   "Topic :: Scientific/Engineering",
 ]
 # Version from setuptools_scm