Change Era from BabbageEra to ConwayEra #3927

Job	Run time
Build haddock using nix	1m 20s
Build & test (plutus-cbor)	1m 30s
Build & test (plutus-merkle-tree)	1m 32s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	2m 46s
Build & test (hydra-plutus)	1m 34s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	1m 55s
Build specification using nix	56s
Build & test (hydra-tui)	2m 19s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	4m 56s
Build & test (hydra-node)	5m 5s
nix flake check	5m 19s
Benchmarks (plutus-merkle-tree, on-chain-cost, $(pwd)/../benchmarks)	1m 47s
Build & test (hydra-cluster)	8m 25s
Publish benchmark results	4s
Documentation	1m 27s
Publish test results	14s
	41m 9s

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