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Bump github.com/slack-go/slack from 0.23.1 to 0.29.0 in /lib #3236

Job	Run time
lint (tools/testlistgenerator)	2m 43s
lint (tools/ecrimagefetcher)	2m 34s
lint (framework)	5m 29s
lint (tools/asciitable)	2m 50s
lint (lib)	4m 56s
lint (parrot)	2m 58s
lint (seth)	3m 36s
lint (tools/ghlatestreleasechecker)	2m 53s
lint (wasp)	5m 28s
lint (tools/workflowresultparser)	2m 26s
lint (tools/gotestloghelper)	2m 32s
	38m 25s