Dijkstrs serialization test failure on CI

[lehins]

This PR has failed on CI: https://github.com/IntersectMBO/cardano-ledger/actions/runs/21627220102/job/62333054612?pr=5548

Reproducers for two failing tests at commit e2e9e1b:

To rerun use: --match "/Dijkstra/CDDL/fix TxBody/transaction_body: Annotator (MemoBytes (DijkstraTxBodyRaw TopTx DijkstraEra))/" --seed 2027127762

To rerun use: --match "/Dijkstra/CDDL/fix TxBody/Generate bytestring from CDDL and decode/encode/transaction_body: MemoBytes (DijkstraTxBodyRaw TopTx DijkstraEra)/" --seed 2027127762