build(deps): bump nix from 0.25.0 to 0.28.0 in /vmm/task #1118

Job	Run time
tests (vmm/sandbox, --all-features)	3m 23s
checks (vmm/sandbox, --all-features)	4m 36s
tests (vmm/task, --all-features)	2m 41s
checks (vmm/task, --all-features)	3m 41s
tests (shim, --all-features)	2m 31s
checks (shim, --all-features)	3m 52s
tests (quark, --all-features)	2m 18s
checks (quark, --all-features)	3m 42s
tests (runc, --all-features)	2m 41s
checks (runc, --all-features)	3m 56s
tests (wasm, --features=wasmedge, 0.13.5)	2m 49s
checks (wasm, --features=wasmedge, 0.13.5)	4m 12s
tests (wasm, --features=wasmtime)	3m 20s
checks (wasm, --features=wasmtime)	4m 5s
	47m 47s

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