fix(users/flokli/nixos-tvix-cache): bump max_traces_per_user

These are quite bursty, and I've seen messages about getting rate
limited.

Change-Id: I73058140957cb5718971fa432c003c2d1b0305e3
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12828
Tested-by: BuildkiteCI
Reviewed-by: Ilan Joselevich <personal@ilanjoselevich.com>

users/flokli/nixos/nixos-tvix-cache/monitoring.nix

@@ -31,6 +31,8 @@ in
         local.path = "/var/lib/tempo/blocks";
       };
       usage_report.reporting_enabled = false;
+      # 10x the default
+      overrides.defaults.ingestion.max_traces_per_user = 10000 * 10;
     };
   };