Bump follow-redirects from 1.14.8 to 1.15.4 in /website (#1625) #2013

Job	Run time
build (2_12, mima)	1m 8s
build (2_12, e2e)	4s
conformance	1m 35s
build (2_12, test)	12m 8s
build (2_13, mima)	1m 12s
build (2_13, e2e)	9s
build (2_13, test)	9m 43s
build (3, mima)	7s
build (3, e2e)	9s
build (3, test)	6m 24s
build (2_12, examples_and_formatting)	2m 23s
build (2_13, scala3_compat_test)	8m 26s
build (3, scala3_compat_test)	5m 45s
ci-passed	1s
	49m 14s

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