Update github action to Ubuntu 22.04

Ubuntu 20.04 runner was removed from Github.

Author: dmsc

.github/workflows/c-cpp.yml

@@ -9,7 +9,7 @@ on:
 jobs:
   build-amd64:
     name: Build and run tests on Linux amd64
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     steps:
     - uses: actions/checkout@v4