fix(ops/code.tvl.fyi): fix josh-proxy cmdline args

It looks like josh is only listening on v4 currently:

1586eab062/josh-proxy/src/bin/josh-proxy.rs (L1429)

Also, the remote URL to push to is (or became) https://cl.tvl.fyi/a, not
just https://cl.tvl.fyi/, update it

Change-Id: Ic59bc51c28be913d833186c715e9a9eb960bbd6e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9591
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI

ops/modules/www/code.tvl.fyi.nix

@@ -52,7 +52,7 @@
 
         # Git operations on depot.git hit josh
         location /depot.git {
-            proxy_pass http://localhost:${toString config.services.depot.josh.port};
+            proxy_pass http://127.0.0.1:${toString config.services.depot.josh.port};
         }
 
         # Git clone operations on '/' should be redirected to josh now.