chore(nix): fix missing zlib in nix devshell #1365

Job	Run time
changed_paths	5s
Loom tests (cordyceps)	1m 37s
build boot image (x86_64)	3m 16s
clippy	3m 6s
cargo check (host)	3m 40s
Miri tests (codyceps)	1m 53s
docs	4m 28s
Loom tests (maitake)	4m 24s
Tests (maitake, no-default-features)	1m 44s
rustfmt	20s
cargo test (host)	4m 52s
cargo test (cross x64)	4m 28s
Loom tests (mycelium-util)	57s
	34m 50s

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