Change Era from BabbageEra to ConwayEra #4270

Job	Run time
Build & test (plutus-cbor)	1m 4s
Build haddock using nix	57s
Build & test (plutus-merkle-tree)	1m 7s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	2m 23s
Build & test (hydra-plutus)	1m 3s
Build specification using nix	59s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	1m 33s
nix flake check	4m 9s
Build & test (hydra-tui)	2m 20s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	2m 43s
Build & test (hydra-node)	4m 45s
Benchmarks (plutus-merkle-tree, on-chain-cost, $(pwd)/../benchmarks)	1m 7s
Build & test (hydra-cluster)	4m 31s
Publish benchmark results	0s
Publish test results	0s
Documentation	0s
	28m 41s

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