Bump follow-redirects from 1.15.4 to 1.15.6 in /website #2081

Job	Run time
conformance	2m 24s
build (2_12, mima)	1m 34s
build (2_12, e2e)	8s
build (2_12, test)	10m 9s
build (2_13, mima)	1m 28s
build (2_13, e2e)	5s
build (2_13, test)	10m 6s
build (3, mima)	7s
build (3, e2e)	4s
build (3, test)	7m 50s
build (2_12, examples_and_formatting)	3m 20s
build (2_13, scala3_compat_test)	6m 38s
build (3, scala3_compat_test)	9m 4s
ci-passed	1s
	52m 58s

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