Update GitHub Actions runner to Ubuntu 22.04

Author: XtraCube

.github/workflows/main.yml

@@ -4,7 +4,7 @@ on: [ "push", "pull_request" ]
 
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     steps:
       - uses: actions/checkout@v6