Fix condition for executing step getting upstream builds

We were using wrong input to detemine if the `Get upstream packages versions`
step should be run. The `upstreamBuilds` is not boolean, we should have been
using `useUpstreamBuilds` instead.

.github/workflows/reusable-build-and-publish.yml

@@ -88,7 +88,7 @@ jobs:
         run: yarn install --frozen-lockfile
 
       - name: Get upstream packages versions
-        if: inputs.upstreamBuilds == true
+        if: inputs.useUpstreamBuilds == true
         uses: keep-network/ci/actions/upstream-builds-query@v2
         id: upstream-builds-query
         with: