style: format entire depot with nixpkgs-fmt

This CL can be used to compare the style of nixpkgs-fmt against other
formatters (nixpkgs, alejandra).

Change-Id: I87c6abff6bcb546b02ead15ad0405f81e01b6d9e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/4397
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
Reviewed-by: lukegb <lukegb@tvl.fyi>
Reviewed-by: wpcarro <wpcarro@gmail.com>
Reviewed-by: Profpatsch <mail@profpatsch.de>
Reviewed-by: kanepyork <rikingcoding@gmail.com>
Reviewed-by: tazjin <tazjin@tvl.su>
Reviewed-by: cynthia <cynthia@tvl.fyi>
Reviewed-by: edef <edef@edef.eu>
Reviewed-by: eta <tvl@eta.st>
Reviewed-by: grfn <grfn@gws.fyi>

nix/renderMarkdown/default.nix

@@ -3,6 +3,6 @@
 
 with depot.nix.yants;
 
-defun [ path drv ] (file: pkgs.runCommandNoCC "${file}.rendered.html" {} ''
+defun [ path drv ] (file: pkgs.runCommandNoCC "${file}.rendered.html" { } ''
   cat ${file} | ${depot.tools.cheddar}/bin/cheddar --about-filter ${file} > $out
 '')