[Dep] Ignore unknown class error on build/config/config-downgrade.php on shipmonk/composer-dependency-analyser to 1.8.4 #31495

Job	Run time
Preload php-parser Order	16s
Commented Code	19s
Composer Validate	18s
Help and Version	22s
Active Classes	26s
PHPStan	1m 23s
Check before/after test fixture on no-changes	18s
Check fixture classes are different to nodes	18s
Compatible PHPStan versions	24s
Run with Space in Directory	22s
Finalize classes	27s
PHP Linter	29s
Check no "*.php" files in rules Fixture directory	22s
Detect composer dependency issues	19s
	6m 3s

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