Change Era from BabbageEra to ConwayEra #4229

Job	Run time
nix flake check	2m 21s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	2m 20s
Build haddock using nix	2m 20s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	2m 24s
Build specification using nix	1m 22s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	2m 24s
Benchmarks (plutus-merkle-tree, on-chain-cost, $(pwd)/../benchmarks)	2m 21s
Build & test (plutus-cbor)	2m 19s
Build & test (plutus-merkle-tree)	2m 20s
Build & test (hydra-plutus)	2m 21s
Build & test (hydra-tui)	2m 11s
Build & test (hydra-node)	2m 21s
Build & test (hydra-cluster)	2m 20s
Publish test results	1s
Publish benchmark results	1s
Documentation	1s
	29m 27s

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