Stupid GH. Update Ughbuntu version.

Author: gniftygnome

.github/workflows/check_build.yml

@@ -14,7 +14,7 @@ jobs:
         java: [
           21    # Minimum
         ]
-        os: [ubuntu-20.04]
+        os: [ubuntu-24.04]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout repository

.github/workflows/release.yml

@@ -15,7 +15,7 @@ jobs:
         # Use these Java versions
         java: [21]
         # and run on both Linux and Windows
-        os: [ubuntu-20.04]
+        os: [ubuntu-24.04]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout repository