[fix] avoid changing generic interface in NarrowObjectReturnTypeRector, focus on objects as in definition #31607

Job	Run time
Run with Space in Directory	27s
Preload php-parser Order	20s
PHPStan	1m 33s
Composer Validate	18s
Commented Code	19s
Compatible PHPStan versions	17s
Check before/after test fixture on no-changes	24s
Active Classes	22s
Finalize classes	37s
Check no "*.php" files in rules Fixture directory	17s
Help and Version	24s
Check fixture classes are different to nodes	18s
PHP Linter	32s
Detect composer dependency issues	21s
	6m 29s

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