[php-src] Issue #20760: Test php_cli_server_pdeathsig fails in Alpinelinux CI

[email protected] (andypost)
Newsgroups php.bugs
Message-ID <[email protected]>
Issue: https://github.com/php/php-src/issues/20760
Author: andypost

### Description

It fails only in Gitlab CI jobs and only for x86 and x86_64

```
TEST 17350/17550 [sapi/cli/tests/php_cli_server_pdeathsig.phpt]
TEST 17350/17550 [sapi/cli/tests/php_cli_server_pdeathsig.phpt]
========DIFF========
001- Done
001+ Fatal error: Uncaught Exception: Workers were not properly terminated. Before: 336413, 336414, after: 336413, 336414 in /builds/bigalpaca/aports/community/php83/src/php-8.3.29/sapi/cli/tests/php_cli_server_pdeathsig.php:34
002+ Stack trace:
003+ #0 {main}
004+   thrown in /builds/bigalpaca/aports/community/php83/src/php-8.3.29/sapi/cli/tests/php_cli_server_pdeathsig.php on line 34
========DONE========
FAIL Killing server should terminate all worker processes [sapi/cli/tests/php_cli_server_pdeathsig.phpt]
```
Looks like it started to happen consistently 2-3 releases ago


### PHP Version

```plain
PHP 8.3-8.5
```

### Operating System

Alpinelinux
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