Merge pull request #334 from ElementsProject/bump-nix #855

Job	Run time
unit-tests	4m 20s
integration-tests (bitcoin-cln)	17m 51s
integration-tests (bitcoin-lnd)	20m 55s
integration-tests (liquid-cln)	16m 39s
integration-tests (liquid-lnd)	16m 49s
integration-tests (misc-integration)	16m 54s
integration-tests (lwk-cln)	15m 50s
integration-tests (lwk-lnd)	16m 3s
	2h 5m 21s

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