fix for PHP 8.4

[remicollet]

From UPGRADING.INTERNALS

   - The php_strtoupper(), php_string_toupper(), php_strtolower(), and
     php_string_tolower() functions has been removed, use zend_str_toupper(),
     zend_string_toupper(), zend_str_tolower(), and zend_string_tolower()
     respectively instead.

[remicollet]

Notice, may be strange but

• zend_str_tolower exists since php 5
• zend_str_toupper exists since php 8.2

[remicollet]

1 more commit for 8.5

[remicollet]

Notice: also need bukka/phpc#4 for 8.5.0alpha3

[bukka]

phpc bumped as well

[dktapps]

can we get a new version tagged for PECL? it's been a minute

[bukka]

Yeah will create a new release this month.