Reduce max-parallel from 4 to 2 in release workflow (#1332)

Author: pacostas

stack/.github/workflows/create-release.yml

@@ -439,7 +439,7 @@ jobs:
     if: ${{ needs.preparation.outputs.polling_type == 'hash' }}
     needs: preparation
     strategy:
-      max-parallel: 4
+      max-parallel: 2
       matrix:
         stacks: ${{ fromJSON(needs.preparation.outputs.stacks) }}
         arch: ${{ fromJSON(needs.preparation.outputs.architectures) }}