Update nikic/php-parser requirement from ^5.3 to ^5.6

[dependabot]

Updates the requirements on nikic/php-parser to permit the latest version.

Release notes

Sourced from nikic/php-parser's releases.

PHP-Parser 5.6.1

Fixed

• Fixed Param::isPublic() for parameters with asymmetric visibility keyword.
• Fixed PHP 8.5 deprecation warnings for SplObjectStorage methods.

Added

• Added cast kind attributes to Cast\Int_, Cast\Bool_ and Cast\String_. These allow distinguishing the deprecated versions of these casts.

Changelog

Sourced from nikic/php-parser's changelog.

Version 5.6.1 (2025-08-13)

Fixed

• Fixed Param::isPublic() for parameters with asymmetric visibility keyword.
• Fixed PHP 8.5 deprecation warnings for SplObjectStorage methods.

Added

• Added cast kind attributes to Cast\Int_, Cast\Bool_ and Cast\String_. These allow distinguishing the deprecated versions of these casts.

Version 5.6.0 (2025-07-27)

Added

• [8.5] Added support for clone with arbitrary function arguments. This will be parsed as an Expr\FuncCall node, instead of the usual Expr\Clone_ node.
• [8.5] Permit declaration of function clone for use in stubs.
• [8.5] Added support for the pipe operator, represented by Expr\BinaryOp\Pipe.
• [8.5] Added support for the (void) cast, represented by Expr\Cast\Void_.
• [8.5] Added support for the final modifier on promoted properties.
• Added CallLike::getArg() to fetch an argument by position and name.

Version 5.5.0 (2025-05-31)

Added

• [8.5] Added support for attributes on constants. Stmt\Const_ now has an attrGroups subnode.
• Added weakReferences option to NodeConnectingVisitor and ParentConnectingVisitor. This will create the parent/next/prev references as WeakReferences, to avoid making the AST cyclic and thus increasing GC pressure.

Changed

• Attributes on parameters are now printed on separate lines if the pretty printer target version is PHP 7.4 or older (which is the default). This allows them to be interpreted as comments, instead of causing a parse error. Specify a target version of PHP 8.0 or newer to restore the previous behavior.

Version 5.4.0 (2024-12-30)

Added

• Added Property::isAbstract() and Property::isFinal() methods.
• Added PropertyHook::isFinal() method.

... (truncated)

Commits

• f103601 Release PHP-Parser 5.6.1
• f4097dd Fix branch-alias for dev-master (#1101)
• 02dcdd7 Avoid deprecated SplObjectStorage::attach/detach
• f7d2856 Add PHP 8.5 to CI
• 4369a74 Update phpstan baseline
• 5ad295a Add cast kinds for bool, int, string (#1098)
• 63114fe Fix Param::isPublic() for param with asymmetric visibility
• 221b0d0 Release PHP-Parser 5.6.0
• 3b8d8ab Add special case for clone in fuzzer
• c724dde Allow final on promoted properties
• Additional commits viewable in compare view

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