Bump symfony/yaml from 6.3.8 to 6.4.0 #1635

Job	Run time
build (STATIC_CODE_ANALYSIS, 8.1, FALSE, ^4)	28s
build (INTEGRATED_TEST_ON_OLDEST_SUPPORTED, 8.1, FALSE, ^4)	31s
build (INTEGRATED_TEST_ON_PREVIOUS_MINOR, 8.1, FALSE, ^4)	2m 43s
build (ISOLATED_TEST_ON_CURRENT, 8.1, FALSE, ^4)	1m 50s
build (INTEGRATED_TEST_ON_CURRENT, 8.1, FALSE, ^4)	2m 48s
build (ISOLATED_TEST_ON_CURRENT_DEV, 8.1, FALSE, ^4)	1m 52s
build (INTEGRATED_TEST_ON_CURRENT_DEV, 8.1, FALSE, ^4)	2m 46s
build (STRICT_DEPRECATED_CODE_SCAN, 8.1, FALSE, ^4)	1m 25s
build (ISOLATED_TEST_ON_NEXT_MINOR, 8.1, FALSE, ^4)	2m 50s
build (DEPRECATED_CODE_SCAN_W_CONTRIB, 8.1, FALSE, ^4)	1m 3s
build (INTEGRATED_TEST_ON_NEXT_MINOR_DEV, 8.1, FALSE, ^4)	2m 47s
build (ISOLATED_TEST_ON_NEXT_MINOR_DEV, 8.1, FALSE, ^4)	2m 30s
build (LOOSE_DEPRECATED_CODE_SCAN, 8.1, FALSE, ^4)	1m 5s
build (INTEGRATED_TEST_ON_LATEST_LTS, 8.2, FALSE)	59s
build (ISOLATED_TEST_ON_CURRENT, 8.1, TRUE)	2m 19s
build (ISOLATED_TEST_ON_CURRENT, 8.2)	1m 58s
all-successful	5s
	29m 59s

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