fix: remove 403 status code from default config

As suggested in
[#1157](lycheeverse/lychee#1157) and merged in [#1377](lycheeverse/lychee#1377), the HTTP status code 403 was removed from the default
configuration.

With this change, the default configuration in the docs will follow what
is described at [README#Commandline Parameters](https://github.com/lycheeverse/lychee?tab=readme-ov-file#commandline-parametersy).

src/content/docs/usage/cli.md

@@ -150,7 +150,7 @@ Options:
           separated list of accepted status codes. This example will accept 200, 201,
           202, 203, 204, 429, and 500 as valid status codes.
 
-          [default: 100..=103,200..=299,403..=403]
+          [default: 100..=103,200..=299]
 
       --include-fragments
           Enable the checking of fragments in links