Remove no-longer useful PHPStan annotation #145

Job	Run time
Run static analysis	17s
Run backward compatibility tests	38s
Run the test suite (5.3, composer:v1)	1m 36s
Run the test suite (5.3, composer:v2)	32s
Run the test suite (5.4, composer:v1)	58s
Run the test suite (5.4, composer:v2)	30s
Run the test suite (5.5, composer:v1)	57s
Run the test suite (5.5, composer:v2)	32s
Run the test suite (5.6, composer:v1)	1m 27s
Run the test suite (5.6, composer:v2)	30s
Run the test suite (7.0, composer:v1)	1m 6s
Run the test suite (7.0, composer:v2)	22s
Run the test suite (7.1, composer:v1)	34s
Run the test suite (7.1, composer:v2)	26s
Run the test suite (7.2, composer:v1)	41s
Run the test suite (7.2, composer:v2)	37s
Run the test suite (7.3, composer:v1)	33s
Run the test suite (7.3, composer:v2)	24s
Run the test suite (7.4, composer:v1)	34s
Run the test suite (7.4, composer:v2)	36s
Run the test suite (8.0, composer:v1)	55s
Run the test suite (8.0, composer:v2)	24s
Run the test suite (8.1, composer:v1)	1m 0s
Run the test suite (8.1, composer:v2)	37s
Run the test suite (8.2, composer:v2)	24s
Run the test suite (8.3, composer:v2, --ignore-platform-reqs, true)	23s
	17m 33s

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