Update ci.yml (#431)

* Update ci.yml

* remove python 3.9

* Update ci.yml

Author: tschm

Diff for: .github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         os: [ ubuntu-latest, windows-latest, macos-latest ]
-        python-version: ['3.9', '3.10', '3.11', '3.12' ]
+        python-version: ['3.10', '3.11', '3.12', '3.13' ]
         exclude:
           - os: windows-latest
             python-version: '3.12'