[WARNING] Looking for Plug_Cowboy when using Bandit

[ndrean]

Describe the bug
Firstly, thks for this work. Just a compilation warning.
I am using Bandit, not Cowboy and metrics_server: :disabled and PromEx is looking for plug_cowboy.

==> prom_ex
Compiling 40 files (.ex)
     warning: Plug.Cowboy.child_spec/1 is undefined (module Plug.Cowboy is not available or is yet to be defined)
     │
 556 │       Plug.Cowboy.child_spec(
     │                   ~
     │
     └─ lib/prom_ex.ex:556:19: PromEx.metrics_server_child_spec/4

To Reproduce
Steps to reproduce the behavior:

Use Bandit, not PlugCowboy in the dependencies.

Expected behavior
No warning.

Environment

• Elixir version: 1.18
• Erlang/OTP version: 28
• Grafana version:
• Prometheus version:

Additional context
Add any other context about the problem here.