Bump nix from 0.26 to 0.27 #274

Job	Run time
cargo-deny (advisories)	33s
cargo-deny (bans licenses sources)	24s
lint	43s
aarch64-apple-ios / build	36s
aarch64-apple-darwin / build	50s
aarch64-unknown-linux-gnu / build	52s
aarch64-unknown-linux-musl / build	49s
arm-linux-androideabi / build	39s
armv7-linux-androideabi / build	31s
i686-pc-windows-gnu / build	3m 13s
i686-pc-windows-msvc / build	3m 3s
i686-unknown-linux-gnu / build	56s
i686-unknown-linux-musl / build	43s
msrv / build	2m 55s
x86_64-apple-darwin / build	44s
x86_64-pc-windows-gnu / build	3m 17s
x86_64-pc-windows-msvc / build	3m 4s
x86_64-unknown-freebsd / build	31s
x86_64-unknown-linux-gnu / build	34s
x86_64-unknown-linux-musl / build	38s
x86_64-unknown-netbsd / build	42s
	26m 17s

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