fix(nix-compat/nix_daemon): fix outdated comment

We're not saying 2.3 here anymore in all cases, but use the version
specified in the `nix_version` function argument.

Change-Id: I86c34f97eea4141b8431de7c6a784750d6b7c2cb
Reviewed-on: https://cl.tvl.fyi/c/depot/+/13166
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Reviewed-by: Brian Olsen <me@griff.name>

tvix/nix-compat/src/nix_daemon/worker_protocol.rs

@@ -215,9 +215,7 @@ where
             let _reserve_space = conn.read_u64_le().await?;
         }
         if picked_version.minor() >= 33 {
-            // Nix version. We're plain lying, we're not Nix, but eh…
-            // Setting it to the 2.3 lineage. Not 100% sure this is a
-            // good idea.
+            // Nix version.
             wire::write_bytes(&mut conn, nix_version).await?;
             conn.flush().await?;
         }