Fix deprecated Ubuntu Image being used for workflow

Author: Dragon-Seeker

.github/workflows/build.yml

@@ -16,7 +16,7 @@ jobs:
         java: [
             21
         ]
-        os: [ ubuntu-20.04 ]
+        os: [ ubuntu-latest ]
     runs-on: ${{ matrix.os }}
     steps:
       - name: checkout repository