fix: correct uses of U_ZERO_ERROR #106

Job	Run time
Code coverage (8.2, 70.1)	1m 23s
Test for Memory Leaks	6m 16s
Coding standards	33s
Tests: PHP 8.2, ICU 70.1	1m 48s
Tests: PHP 8.2, ICU 71.1	1m 35s
Tests: PHP 8.2, ICU 72.1	2m 10s
Tests: PHP 8.2, ICU 73.1	1m 59s
Tests: PHP 8.2, ICU 73.2	3m 22s
Tests: PHP 8.3, ICU 70.1	2m 4s
Tests: PHP 8.3, ICU 71.1	1m 55s
Tests: PHP 8.3, ICU 72.1	1m 38s
Tests: PHP 8.3, ICU 73.1	1m 42s
Tests: PHP 8.3, ICU 73.2	1m 43s
Install with pecl on php:8.2-cli-alpine3.18	23s
Install with pecl on php:8.2-cli-bookworm	28s
	28m 59s

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