set ubuntu version to 20.04

GunnerUjjwol · GunnerUjjwol · commit 385d602ab204 · 2022-11-28T14:32:19.000+02:00
diff --git a/.github/workflows/pythonpackage.yml b/.github/workflows/pythonpackage.yml
@@ -12,7 +12,7 @@ on:
 jobs:
   build:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
       matrix:
