[reportlab] Bump to 4.5.1 (#15808) #15419

Job	Run time
stubtest: stdlib (windows-latest, 3.15)	1m 52s
stubtest: stdlib (macos-latest, 3.11)	31s
stubtest: stdlib (ubuntu-latest, 3.10)	39s
stubtest: stdlib (windows-latest, 3.11)	2m 40s
stubtest: stdlib (ubuntu-latest, 3.15)	53s
stubtest: stdlib (windows-latest, 3.12)	1m 18s
stubtest: stdlib (windows-latest, 3.14)	2m 8s
stubtest: stdlib (windows-latest, 3.13)	1m 10s
stubtest: stdlib (ubuntu-latest, 3.14)	39s
stubtest: stdlib (macos-latest, 3.10)	1m 6s
stubtest: stdlib (ubuntu-latest, 3.11)	35s
stubtest: stdlib (macos-latest, 3.12)	36s
stubtest: stdlib (macos-latest, 3.15)	49s
stubtest: stdlib (macos-latest, 3.14)	47s
stubtest: stdlib (ubuntu-latest, 3.12)	38s
stubtest: stdlib (macos-latest, 3.13)	41s
stubtest: stdlib (ubuntu-latest, 3.13)	37s
	17m 39s

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