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Change link checking from markdown-link-check to lychee (#1570) #3343

Job	Run time
integration-test	1m 1s
build	1m 3s
test (8)	1m 4s
test (11)	1m 1s
test (17)	59s
test (20)	1m 3s
markdown-link-check / markdown-link-check	35s
markdown-lint-check / markdown-lint-check	7s
misspell-check / misspell-check	6s
shell-script-check / shell-script-check	2s
publish-snapshots	1m 14s
required-status-check	0s
	8m 15s

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