github: ci: switch to ubuntu-22.04

Signed-off-by: Álvaro Fernández Rojas <[email protected]>

Author: Noltari

.github/workflows/ci.yml

@@ -1,10 +1,12 @@
 name: CI
 
-on: [push, pull_request]
+on:
+  - push
+  - pull_request
 
 jobs:
   CI:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
       - name: 'Check out code'
         uses: actions/checkout@v4