* PHPC-2433: Test PHP 8.4 on Evergreen

* Skip PHP 8.4 on RHEL PPC/Zseries

#1718)

Co-authored-by: Michiel Vermeersch <[email protected]>

* v1.x:
  PHPC-2460: Use zend_zval_type_name instead of internal macros (#1714)
  PHPC-2464: Emit deprecation notice for negative "limit" Query option (#1710)
  PHPC-2458: Deprecate float arg for UTCDateTime constructor (#1695)
  Document how to run part of the test suite (#1690)
  Bump version to 1.21-dev (#1661)
  Update branch names for GHA workflows (#1646)
  PHPC-2343: Require PHP 8.1 (#1631)