Merge pull request #107 from wnienhaus/build_on_ubuntu_2204

Update builder image to ubuntu-22.04

Author: wnienhaus

.github/workflows/run_tests.yaml

@@ -11,7 +11,7 @@ on: [push, pull_request]
 
 jobs:
   tests:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
     - uses: actions/checkout@v3
       with: