ext/pcre: update to PCRE2 v10.44 (#14498)

Previously: GH-13413.

This version also contains a fix with `preg_match('\X')`, so that it
can correctly detect grapheme clusters (PCRE

ext/pcre: update to PCRE2 v10.44 (#14498)

Previously: GH-13413.

This version also contains a fix with `preg_match('\X')`, so that it
can correctly detect grapheme clusters (PCRE2Project/pcre2#410).
This is useful to correctly [polyfill the new `grapheme_str_split`
function](https://php.watch/versions/8.4/grapheme_str_split#polyfill).

Diff: pcre2lib [v10.43..v10.44](https://github.com/PCRE2Project/pcre2/compare/pcre2-10.43...pcre2-10.44)

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