Add missing property to milestone workflow

Author: jvalkeal

.github/workflows/release-milestone.yml

@@ -45,7 +45,7 @@ jobs:
     # version to get used with tagging
     - name: Configure Milestone Version
       run: |
-        jfrog rt gradle milestoneVersion -P${{ github.event.inputs.milestone }}
+        jfrog rt gradle milestoneVersion -PstatemachineMilestone=${{ github.event.inputs.milestone }}
         echo PROJECT_VERSION=$(jfrog rt gradle "properties -q" | grep "version:" | awk '{print $2}')-${{ github.event.inputs.milestone }} >> $GITHUB_ENV
     # build and publish to staging repo.
     # we've allready tested with snapshots so no need to test