bug #157 fix: unknown caddy language (mikaelkael)

This PR was merged into the main branch.

Discussion
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fix: unknown caddy language

symfony/symfony-docs@83fa5c6 introduced a new code-block directive 'Caddy'

We have now builds errors like:
`[ERROR] There were some errors while building the docs:
         Build errors from "2023-04-25 08:14:03"
         Error while processing "code-block" directive: "Unsupported code block language "caddy". Added it in
         SymfonyDocsBuilder\Renderers\CodeNodeRenderer" in file "security"`

I added 'caddy' as plaintext as there is no definition of caddy's syntax in https://github.com/scrivo/highlight.php

Commits
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73c2ab1 fix: unknown caddy's language

Author: javiereguiluz

src/Renderers/CodeNodeRenderer.php

@@ -21,6 +21,7 @@ class CodeNodeRenderer implements NodeRenderer
     private static $isHighlighterConfigured = false;
 
     private const LANGUAGES_MAPPING = [
+        'caddy' => 'plaintext',
         'env' => 'bash',
         'html+jinja' => 'twig',
         'html+twig' => 'twig',