[hamlet] Update to php 8.1

[joanhey]

Ok with fpm/fastcgi #6894

With workerman fail PARALLEL:

/parallel/src/runtime.c: In function 'zm_startup_PARALLEL_RUNTIME':
hamlet-workerman: /parallel/src/runtime.c:161:42: error: 'zend_class_serialize_deny' undeclared (first use in this function); did you mean 'zend_ce_serializable'?
hamlet-workerman:   161 |     php_parallel_runtime_ce->serialize = zend_class_serialize_deny;
hamlet-workerman:       |                                          ^~~~~~~~~~~~~~~~~~~~~~~~~
hamlet-workerman:       |                                          zend_ce_serializable
hamlet-workerman: /parallel/src/runtime.c:161:42: note: each undeclared identifier is reported only once for each function it appears in
hamlet-workerman: /parallel/src/runtime.c:162:44: error: 'zend_class_unserialize_deny' undeclared (first use in this function); did you mean 'zend_unserialize_data'?                                                                                                                 
hamlet-workerman:   162 |     php_parallel_runtime_ce->unserialize = zend_class_unserialize_deny;                                          
hamlet-workerman:       |                                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~
hamlet-workerman:       |                                            zend_unserialize_data
hamlet-workerman: make: *** [Makefile:213: src/runtime.lo] Error 1