feat(symfony-security-auditor): add JSON schema

[vinceAmstoutz]

Q	A
License	MIT
Packagist	https://packagist.org/packages/vinceamstoutz/symfony-security-auditor

Adds a JSON Schema modeline to the symfony_security_auditor recipe config so
editors provide completion, validation and inline docs for the bundle config.

# $schema: https://raw.githubusercontent.com/vinceamstoutz/symfony-security-auditor/main/resources/schema.json

• Works in PhpStorm/IntelliJ (native # $schema: support) and the Red Hat
  yaml-language-server (VS Code, Neovim), which also understands the # $schema: form.
• The URL floats on the package's main branch on purpose: Symfony Flex has no
  package-version placeholder for recipe file contents, so a pinned tag would need
  editing on every release. A floating ref keeps the recipe maintenance-free and always
  resolves to the current schema.
• One-line, comment-only change — no behavioural impact on the generated config.

Schema lives at resources/schema.json in the bundle repo.

[symfony-recipes-bot]

Thanks for the PR 😍

How to test these changes in your application

1. Define the SYMFONY_ENDPOINT environment variable:

   # On Unix-like (BSD, Linux and macOS)
   export SYMFONY_ENDPOINT=https://raw.githubusercontent.com/symfony/recipes-contrib/flex/pull-2007/index.json
   # On Windows
   SET SYMFONY_ENDPOINT=https://raw.githubusercontent.com/symfony/recipes-contrib/flex/pull-2007/index.json

2. Install the package(s) related to this recipe:

   composer req symfony/flex
   composer req 'vinceamstoutz/symfony-security-auditor:^1.0'

3. Don't forget to unset the SYMFONY_ENDPOINT environment variable when done:

   # On Unix-like (BSD, Linux and macOS)
   unset SYMFONY_ENDPOINT
   # On Windows
   SET SYMFONY_ENDPOINT=

Diff between recipe versions

In order to help with the review stage, I'm in charge of computing the diff between the various versions of patched recipes.
I'm going keep this comment up to date with any updates of the attached patch.

[vinceAmstoutz]

@diimpp FYI the remaining red ci checks are as expected: the bundle supports PHP ≥ 8.3 and Symfony ≥
7.4 only, so Symfony 6 / PHP 8.1–8.2 skeleton installs can't resolve.