Bump symfony/config from 6.4.0 to 6.4.3 #1731

Job	Run time
build (STATIC_CODE_ANALYSIS, 8.1, FALSE, ^4)	27s
build (INTEGRATED_TEST_ON_OLDEST_SUPPORTED, 8.1, FALSE, ^4)	23s
build (INTEGRATED_TEST_ON_PREVIOUS_MINOR, 8.1, FALSE, ^4)	2m 38s
build (ISOLATED_TEST_ON_CURRENT, 8.1, FALSE, ^4)	2m 38s
build (INTEGRATED_TEST_ON_CURRENT, 8.1, FALSE, ^4)	2m 38s
build (ISOLATED_TEST_ON_CURRENT_DEV, 8.1, FALSE, ^4)	2m 9s
build (INTEGRATED_TEST_ON_CURRENT_DEV, 8.1, FALSE, ^4)	3m 1s
build (STRICT_DEPRECATED_CODE_SCAN, 8.1, FALSE, ^4)	1m 0s
build (ISOLATED_TEST_ON_NEXT_MINOR, 8.1, FALSE, ^4)	25s
build (DEPRECATED_CODE_SCAN_W_CONTRIB, 8.1, FALSE, ^4)	59s
build (INTEGRATED_TEST_ON_NEXT_MINOR_DEV, 8.1, FALSE, ^4)	30s
build (ISOLATED_TEST_ON_NEXT_MINOR_DEV, 8.1, FALSE, ^4)	37s
build (LOOSE_DEPRECATED_CODE_SCAN, 8.1, FALSE, ^4)	1m 11s
build (INTEGRATED_TEST_ON_LATEST_LTS, 8.2, FALSE)	21s
build (ISOLATED_TEST_ON_CURRENT, 8.1, TRUE)	2m 40s
build (ISOLATED_TEST_ON_CURRENT, 8.2)	2m 36s
all-successful	2s
	24m 15s

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