Mark releases as pre-release by default

Author: jeremystretch

.github/workflows/release.yaml

@@ -126,4 +126,4 @@ jobs:
           release_name: ${{ needs.get-next-version.outputs.release-version }}
           body: ${{ needs.get-release-notes.outputs.release-notes }}
           draft: false
-          prerelease: false
+          prerelease: true