Try to get the release packages publishing again.

As per the docs on:
https://github.com/eregon/publish-release

> Note that the release must *not be marked as prerelease* for this to work.

For some reason, we were marking the release as pre-release before and
this was working, but the docs here seem pretty clear, so I'm going to
try it.

.github/workflows/releaseSnapshotPackage.yml

@@ -48,7 +48,7 @@ jobs:
           body: |
             Automatic snapshot release of torch-mlir.
           draft: true
-          prerelease: true
+          prerelease: false
 
       - name: "Invoke workflow :: Build and Test"
         uses: benc-uk/workflow-dispatch@v1