Set image for GitHub Actions to ubuntu-22.04

See actions/runner-images#10636

Author: fsteeg

.github/workflows/build.yml

@@ -7,7 +7,7 @@ env:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
     - uses: actions/checkout@v2
     - name: Set up JDK 1.8