support php8.1 style

[eeliu]

• pinpoint_php module support php8.1.x
• to PHP 8.1: src/PHP/pinpoint_php.cpp:644:20: error: invalid conversion from 'void (*)(int, zend_string*, uint32_t, zend_string*)' {aka 'void (*)(int, _zend_string*, unsigned int, _zend_string*)'} to 'void (*)(int, const char*, uint32_t, zend_string*)' {aka 'void (*)(int, const char*, unsigned int, _zend_string*)'} [-fpermissive] #379

[codecov]

Codecov Report

Merging #382 (6e617da) into master (81470b5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #382   +/-   ##
=======================================
  Coverage   74.40%   74.40%           
=======================================
  Files          20       20           
  Lines         918      918           
=======================================
  Hits          683      683           
  Misses        235      235           

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[EyelynSu]

LGTM