Dev: PHP 8.2 support

[kenjis]

• [ ] Add PHP 8.2 GitHub Actions
  • #6172
• [ ] PHP: rfc:deprecate_dynamic_properties
  • #6162
  • #6187
  • #6198
• [ ] PHP: rfc:deprecate_partially_supported_callables
• [ ] PHP: rfc:remove_utf8_decode_and_utf8_encode
• [ ] PHP: rfc:strtolower-ascii

References:

• https://stitcher.io/blog/new-in-php-82