Allow `int` parts in `StringUtil::joinNonEmpty` #207

Job	Run time
composer-validate	7s
code-coverage	31s
static-code-analysis	24s
Tests - PHP 7.4, Illuminate ^8.73, lowest	28s
Tests - PHP 7.4, Illuminate ^8.73, highest	20s
Tests - PHP 8.0, Illuminate ^8.73, lowest	23s
Tests - PHP 8.0, Illuminate ^9, lowest	27s
Tests - PHP 8.0, Illuminate ^8.73, highest	26s
Tests - PHP 8.0, Illuminate ^9, highest	27s
Tests - PHP 8.1, Illuminate ^8.73, lowest	28s
Tests - PHP 8.1, Illuminate ^9, lowest	28s
Tests - PHP 8.1, Illuminate ^10, lowest	30s
Tests - PHP 8.1, Illuminate ^8.73, highest	19s
Tests - PHP 8.1, Illuminate ^9, highest	27s
Tests - PHP 8.1, Illuminate ^10, highest	27s
Tests - PHP 8.2, Illuminate ^8.73, lowest	20s
Tests - PHP 8.2, Illuminate ^9, lowest	27s
Tests - PHP 8.2, Illuminate ^10, lowest	22s
Tests - PHP 8.2, Illuminate ^11, lowest	28s
Tests - PHP 8.2, Illuminate ^8.73, highest	17s
Tests - PHP 8.2, Illuminate ^9, highest	18s
Tests - PHP 8.2, Illuminate ^10, highest	18s
Tests - PHP 8.2, Illuminate ^11, highest	26s
Tests - PHP 8.3, Illuminate ^8.73, lowest	25s
Tests - PHP 8.3, Illuminate ^9, lowest	20s
Tests - PHP 8.3, Illuminate ^10, lowest	17s
Tests - PHP 8.3, Illuminate ^11, lowest	32s
Tests - PHP 8.3, Illuminate ^8.73, highest	16s
Tests - PHP 8.3, Illuminate ^9, highest	24s
Tests - PHP 8.3, Illuminate ^10, highest	19s
Tests - PHP 8.3, Illuminate ^11, highest	24s
	12m 5s

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