Update Java version in deploy_release workflow

Author: LlmDl

.github/workflows/deploy_release.yml

@@ -11,7 +11,7 @@ jobs:
         runs-on: ubuntu-latest
         strategy:
             matrix:
-                java: ['17']
+                java: ['21']
         name: Creating TownyProvinces Release
         steps:
             - name: checkout repo content