Bump cachix/install-nix-action from V28 to 29 (#1657) #5654

Job	Run time
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	2m 43s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	1m 48s
Build & test (plutus-cbor)	1m 11s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	5m 10s
Build & test (plutus-merkle-tree)	1m 16s
Benchmarks (plutus-merkle-tree, on-chain-cost, $(pwd)/../benchmarks)	1m 25s
Build & test (hydra-plutus)	1m 16s
Build haddock using nix	1m 11s
Build & test (hydra-tui)	3m 8s
Build & test (hydra-node)	5m 43s
Build & test (hydra-tx)	1m 50s
Build & test (hydra-cluster)	6m 41s
Build specification using nix	1m 33s
nix flake check	3m 55s
Publish benchmark results	0s
Publish test results	1s
Documentation	1s
	38m 52s

Provide feedback