Bump symfony/yaml from 6.3.8 to 6.4.0 #1632

Job	Run time
build (STATIC_CODE_ANALYSIS, 8.1, FALSE, ^4)	36s
build (INTEGRATED_TEST_ON_OLDEST_SUPPORTED, 8.1, FALSE, ^4)	26s
build (INTEGRATED_TEST_ON_PREVIOUS_MINOR, 8.1, FALSE, ^4)	2m 57s
build (ISOLATED_TEST_ON_CURRENT, 8.1, FALSE, ^4)	1m 57s
build (INTEGRATED_TEST_ON_CURRENT, 8.1, FALSE, ^4)	2m 41s
build (ISOLATED_TEST_ON_CURRENT_DEV, 8.1, FALSE, ^4)	2m 32s
build (INTEGRATED_TEST_ON_CURRENT_DEV, 8.1, FALSE, ^4)	3m 22s
build (STRICT_DEPRECATED_CODE_SCAN, 8.1, FALSE, ^4)	27s
build (ISOLATED_TEST_ON_NEXT_MINOR, 8.1, FALSE, ^4)	2m 11s
build (DEPRECATED_CODE_SCAN_W_CONTRIB, 8.1, FALSE, ^4)	1m 29s
build (INTEGRATED_TEST_ON_NEXT_MINOR_DEV, 8.1, FALSE, ^4)	3m 2s
build (ISOLATED_TEST_ON_NEXT_MINOR_DEV, 8.1, FALSE, ^4)	2m 6s
build (LOOSE_DEPRECATED_CODE_SCAN, 8.1, FALSE, ^4)	1m 26s
build (INTEGRATED_TEST_ON_LATEST_LTS, 8.2, FALSE)	31s
build (ISOLATED_TEST_ON_CURRENT, 8.1, TRUE)	2m 1s
build (ISOLATED_TEST_ON_CURRENT, 8.2)	1m 56s
all-successful	5s
	29m 45s

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