CI: remove Python 3.9 and 3.10, add 3.15

.github/workflows/ci.yml

@@ -21,23 +21,22 @@ jobs:
       fail-fast: false
       matrix:
         python:
-          - '3.9'
-          - '3.10'
           - '3.11'
           - '3.12'
           - '3.13'
           - '3.14'
+          - '3.15'
         os:
           - ubuntu-latest
         include:
           - os: macos-latest
-            python: '3.9'
+            python: '3.11'
           - os: macos-latest
-            python: '3.14'
+            python: '3.15'
           - os: windows-latest
-            python: '3.9'
+            python: '3.11'
           - os: windows-latest
-            python: '3.14'
+            python: '3.15'
 
     steps:
       - name: Clone repository