Update build_java_hello_world_reusable.yml (#191)

Author: shaobo-he-aws

.github/workflows/build_java_hello_world_reusable.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       matrix:
         toolchain:
-          - stable
+          - '1.80'
     steps:
       - name: Setup Java
         uses: actions/setup-java@v4