Quote {{ it }} in justfile to fix recipe in Windows

Since Windows was failing due to the shell called by `just`
treating `\` path separators as escape characters (the main effect
of which was that they were removed in quote removal).

This was not a problem for internal-tools, but it broke the `just`
recipe at least in some ways of running it on Windows, including CI
and at least one local system tested.

justfile

@@ -259,7 +259,7 @@ find-yanked:
 # Find shell scripts whose +x/-x bits and magic bytes (e.g. `#!`) disagree
 check-mode:
     cargo build -p internal-tools
-    {{ it }} check-mode
+    "{{ it }}" check-mode
 
 # Delete gix-packetline-blocking/src and regenerate from gix-packetline/src
 copy-packetline: