fix prepare-release.yaml

Author: Jonas-Isr

.github/workflows/prepare-release.yaml

@@ -15,7 +15,7 @@ env:
   CI_BUILD_WORKFLOW: "continuous-integration.yaml" # Name of the workflow that should be triggered for CI build
   RELEASE_ARTIFACT_NAME: "release-artifacts" # Name of the artifact that should be downloaded from the CI workflow
   SDK_TARGETS_NAME: "sdk-targets" # Name of the SDK target directories artifact that should be downloaded from the CI workflow
-
+  JAVA_VERSION: 17
   DOCS_REPO: SAP/cloud-sdk
 
 jobs: