Fix datum conversion in 'fromShelleyTxOut' when using 'ShelleyBasedEraAlonzo' as input #3376

Job	Run time
build (3.12, 9.6, macos-latest, bash)	6m 19s
build (8.10.7, 3.12, ubuntu-latest, bash)	8m 4s
build (8.10.7, 3.12, windows-latest, C:/msys64/usr/bin/bash.exe -e {0})	10m 42s
build (9.10, 3.12, ubuntu-latest, bash)	4m 22s
build (9.6, 3.12, ubuntu-latest, bash)	5m 52s
build (9.10, 3.12, windows-latest, C:/msys64/usr/bin/bash.exe -e {0})	9m 15s
build (9.6, 3.12, windows-latest, C:/msys64/usr/bin/bash.exe -e {0})	8m 29s
build-complete	1s
release	0s
	53m 4s

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