Bump cachix/install-nix-action from 26 to 27 #3713

Job	Run time
Build & test (plutus-cbor)	1m 10s
Build & test (plutus-merkle-tree)	1m 9s
Build & test (hydra-plutus)	1m 11s
Build & test (hydra-tui)	3m 1s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	2m 35s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	1m 50s
Build & test (hydra-node)	4m 11s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	4m 52s
Benchmarks (plutus-merkle-tree, on-chain-cost, $(pwd)/../benchmarks)	1m 31s
Build & test (hydra-cluster)	8m 1s
Build haddock using nix	1m 16s
nix flake check	3m 42s
Build specification using nix	1m 3s
Publish benchmark results	3s
Publish test results	8s
Documentation	1m 18s
	37m 1s

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