chore: remove Cardano '8.11.0-pre' in CI

Author: jpraynaud

.github/workflows/ci.yml

@@ -290,7 +290,7 @@ jobs:
         mode: ["std"]
         era: ${{ fromJSON(needs.build-ubuntu-X64.outputs.eras) }}
         cardano_node_version:
-          ["8.9.4", "8.12.2", "9.0.0", "8.11.0-pre", "8.12.0-pre"]
+          ["8.9.4", "8.12.2", "9.0.0", "8.12.0-pre"]
         hard_fork_latest_era_at_epoch: [0]
         run_id: ["#1"]
         extra_args: [""]