PHP 8.1 deprecation: Return type of WP_CLI\Iterators\Query

[Soean]

Bug Report

The Query iterator has a deprecation warning. We should add #[\ReturnTypeWillChange] like in #5743

PHP: 8.1.18
WP CLI: 2.8.1
WordPress 6.2.2

Command: wp site list

Error:

Deprecated: Return type of WP_CLI\Iterators\Query::current() should either be compatible with Iterator::current(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /wp-cli/wp-cli/php/WP_CLI/Iterators/Query.php on line 91
Deprecated: Return type of WP_CLI\Iterators\Query::next() should either be compatible with Iterator::next(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /wp-cli/wp-cli/php/WP_CLI/Iterators/Query.php on line 99
Deprecated: Return type of WP_CLI\Iterators\Query::key() should either be compatible with Iterator::key(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /wp-cli/wp-cli/php/WP_CLI/Iterators/Query.php on line 95
Deprecated: Return type of WP_CLI\Iterators\Query::valid() should either be compatible with Iterator::valid(): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /wp-cli/wp-cli/php/WP_CLI/Iterators/Query.php on line 112
Deprecated: Return type of WP_CLI\Iterators\Query::rewind() should either be compatible with Iterator::rewind(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /wp-cli/wp-cli/php/WP_CLI/Iterators/Query.php on line 104