[v3] fix: remove no-op ulimit call from ZigToolchain #2978

Job	Run time
php-cs-fixer	18s
phpstan	31s
Check: need-test label	2s
PHPUnit (PHP 8.4)	16s
Test Bot: analyze PR	0s
Generate test matrix	0s
Ext test: ${{ matrix.combo.extension }} (PHP ${{ matrix.combo.php-version }} · ${{ matrix.combo.os }}-${{ matrix.combo.arch }})	0s
	1m 7s

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