fix: nix evaluation warnings, the xorg package set has been deprecated

[flyingpeakock]

Fixes evaluation warnings introduced by f16ebef due to the xorg package set being deprecated in nixpkgs.

Fixes the following warnings:

evaluation warning: The xorg package set has been deprecated, 'xorg.libXcursor' has been renamed to 'libxcursor'
evaluation warning: The xorg package set has been deprecated, 'xorg.libxcb' has been renamed to 'libxcb'
evaluation warning: The xorg package set has been deprecated, 'xorg.libXdmcp' has been renamed to 'libxdmcp'
evaluation warning: The xorg package set has been deprecated, 'xorg.xcbutilerrors' has been renamed to 'libxcb-errors'
evaluation warning: The xorg package set has been deprecated, 'xorg.xcbutilrenderutil' has been renamed to 'libxcb-render-util'
evaluation warning: The xorg package set has been deprecated, 'xorg.xcbutilwm' has been renamed to 'libxcb-wm'

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[flyingpeakock]

@fufexan any chance you can take a look at this?