Bump Polly from 7.2.4 to 8.4.0 #4359

Job	Run time
build-for-e2e-test (windows-latest)	2m 53s
upload-event-file	3s
build-for-e2e-test (ubuntu-latest)	1m 53s
build (windows-latest)	2m 57s
build-for-e2e-test (macos-latest)	1m 45s
build (ubuntu-latest)	4m 18s
build (macos-latest)	1m 32s
e2e-test (macos-latest, AdoBasic)	34s
e2e-test (macos-latest, Bbs)	36m 47s
e2e-test (macos-latest, AdoCsv)	41s
e2e-test (macos-latest, Ghes)	10m 24s
e2e-test (macos-latest, Github)	5m 41s
e2e-test (ubuntu-latest, AdoBasic)	43s
e2e-test (ubuntu-latest, AdoCsv)	31s
e2e-test (ubuntu-latest, Bbs)	36m 0s
e2e-test (ubuntu-latest, Ghes)	9m 46s
e2e-test (windows-latest, AdoCsv)	2m 19s
e2e-test (ubuntu-latest, Github)	6m 28s
e2e-test (windows-latest, AdoBasic)	2m 33s
e2e-test (windows-latest, Bbs)	36m 58s
e2e-test (windows-latest, Ghes)	15m 5s
e2e-test (windows-latest, Github)	14m 55s
publish	0s
	3h 14m 46s

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