chore(snix): format TOML files

Change-Id: I4c5bf0a378c69a2a22097000583b1abcee089190
Reviewed-on: https://cl.snix.dev/c/snix/+/30602
Tested-by: besadii
Autosubmit: Florian Klink <flokli@flokli.de>
Reviewed-by: Yureka <snix@yuka.dev>

tools/depotfmt.nix

@@ -20,6 +20,11 @@ let
     command = "${pkgs.rustfmt}/bin/rustfmt"
     includes = [ "*.rs" ]
 
+    [formatter.toml]
+    command = "${pkgs.taplo}/bin/taplo"
+    options = [ "format" ]
+    includes = [ "*.toml" ]
+
     [formatter.editorconfig]
     command = "${pkgs.editorconfig-checker}/bin/editorconfig-checker"
     includes = [