Change Era from BabbageEra to ConwayEra #3920

Job	Run time
Build haddock using nix	5m 48s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	5m 19s
Build & test (plutus-cbor)	1m 33s
nix flake check	3m 50s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	4m 26s
Build & test (plutus-merkle-tree)	1m 34s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	5m 47s
Build & test (hydra-plutus)	1m 32s
Build & test (hydra-tui)	5m 56s
Benchmarks (plutus-merkle-tree, on-chain-cost, $(pwd)/../benchmarks)	1m 42s
Build specification using nix	55s
Build & test (hydra-node)	8m 2s
Build & test (hydra-cluster)	11m 32s
Publish benchmark results	0s
Publish test results	15s
Documentation	0s
	58m 11s

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