Bump follow-redirects from 1.15.5 to 1.15.6 #1733

Job	Run time
build (ubuntu, >=20,<21, >=4.1.0,<5.0.0a0, >=4)	2m 56s
jstest/lint (ubuntu, >=20,<21, >=4.1.0,<5.0.0a0, >=4)	5m 14s
smoke source install ubuntu py3.8 lab>=4.1.0,<5	2m 0s
atest ubuntu py3.8 r>=4	26m 8s
smoke source install ubuntu py3.11 lab>=4.1.0,<5	1m 49s
atest ubuntu py3.11 r>=4	26m 46s
atest macos py3.8 r>=4	44m 57s
atest macos py3.11 r>=4	44m 39s
atest windows py3.8 r>=4	34m 13s
atest windows py3.11 r>=4	45m 32s
smoke ubuntu py3.8	43s
smoke ubuntu py3.11	35s
smoke ubuntu pypypy-3.8	1m 39s
smoke macos py3.8	1m 14s
smoke macos py3.11	1m 24s
smoke macos pypypy-3.8	1m 19s
smoke windows py3.8	1m 36s
smoke windows py3.11	1m 32s
smoke windows pypypy-3.8	5m 25s
	4h 9m 41s

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