minor fix

Author: maximiliani

.github/workflows/CI.yml

@@ -37,7 +37,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
         jdk: [17]
-        python-version: [3.10]
+        python-version: [3.9]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout repo