Features

• Merged PR #352: Add io.streams.SequenceInputStream - @thekid

Bugfixes

• Added forward-compatible handling of self and parent for PHP 8.5,
  which resolves these types at compile-time, see php/php-src#17755
  (@thekid)
• Added PHP 8.5 to the test matrix to ensure compatibility with the
  next PHP version, see issue #351
  (@thekid)