Bump reportlab from 3.6.13 to 4.3.0 in /requirements #16489

Job	Run time
tests (python, 05)	16m 55s
tests (python, 6a)	15m 33s
tests (python, bf)	14m 42s
tests (python-sharded-and-javascript)	16m 48s
	1h 3m 58s

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