fix(python): replace lzma with xz when using nix

[tdeebswihart]

I encountered the following problem today when omni attempted to install python in the background:

[1/5] - python (3): deps: evaluating file '/nix/store/93haqkb7bl8l90vpfqgkygrd5l13gafm-source/pkgs/by-name/gd/gdbm/package.nix'
[1/5] - python (3): deps: error:
[1/5] - python (3): deps:        … while calling the 'derivationStrict' builtin
[1/5] - python (3): deps:          at <nix/derivation-internal.nix>:34:12:
[1/5] - python (3): deps:            33|
[1/5] - python (3): deps:            34|   strict = derivationStrict drvAttrs;
[1/5] - python (3): deps:              |            ^
[1/5] - python (3): deps:            35|
[1/5] - python (3): deps:        … while evaluating derivation 'nix-shell'
[1/5] - python (3): deps:          whose name attribute is located at /nix/store/93haqkb7bl8l90vpfqgkygrd5l13gafm-source/pkgs/stdenv/generic/make-derivation.nix:336:7
[1/5] - python (3): deps:        … while evaluating attribute '__impureHostDeps' of derivation 'nix-shell'
[1/5] - python (3): deps:          at /nix/store/93haqkb7bl8l90vpfqgkygrd5l13gafm-source/pkgs/stdenv/generic/make-derivation.nix:451:7:
[1/5] - python (3): deps:           450|       __propagatedSandboxProfile = unique (computedPropagatedSandboxProfile ++ [ propagatedSandboxProfile ]);
[1/5] - python (3): deps:           451|       __impureHostDeps = computedImpureHostDeps ++ computedPropagatedImpureHostDeps ++ __propagatedImpureHostDeps ++ __impureHostDeps ++ stdenv.__extraImpureHostDeps ++ [
[1/5] - python (3): deps:              |       ^
[1/5] - python (3): deps:           452|         "/dev/zero"
[1/5] - python (3): deps:        (stack trace truncated; use '--show-t
[1/5] - python (3): deps: race' to show the full, detailed trace)
[1/5] - python (3): deps:        error: 'lzma' has been renamed to/replaced by 'xz'
[1/5] - python (3): deps: failed to install nix packages: execution error: process exited with status 1; log is available at /var/folders/f0/_2j81h0s4_zf6kjr5qkczmbr0000gn/T/omni-exec.20241031T182130Z.h5Gqe4

It looks like lzma is simply an alias for xz, and that the alias has been removed. I run against nightly nix (at whatever my flake is at now), so I may be ahead of your normal testing.

Since lzma is an alias this should work on both nightly and stable nix