Python 3.8 reached eol (#948)

diff --git a/.github/workflows/pythonpackage.yml b/.github/workflows/pythonpackage.yml
index 8317ccb..22c9beb 100644
--- a/.github/workflows/pythonpackage.yml
+++ b/.github/workflows/pythonpackage.yml
@@ -15,7 +15,7 @@
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8]
+        python-version: [3.12]
 
     steps:
     - uses: actions/checkout@v3