PHP 8.5 support and some maintenance

[spaze]

What's Changed

• Start testing on PHP 8.5 (Start testing on PHP 8.5 #349)
• Add a link to a new Symfony config package that has just dd() and dump() for now (Add a link to a new Symfony config that has just dd() and dump() for now #353)

Internal changes

• Update Dead Code Detector (De-downgrade de Dead Code Detector dev dependency #350)
• Remove nikic/php-parser as a direct dev dependency (Remove nikic/php-parser as a direct dev dependency #347)
• Support nikic/php-parser 5.6.1 in tests (Stop the "Undefined constant PhpParser\Node\Expr\Cast\Bool_::KIND_BOOL" errors with PHP-Parser 5.6.1 #348)
• Bump actions/checkout from 4 to 5 (Bump actions/checkout from 4 to 5 #345)
• Narrow the thrown type in docblock to void when no exception is thrown (Narrow the thrown type when no exception is thrown #352)

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This discussion was created from the release PHP 8.5 support and some maintenance.