chore(deps): bump @slack/bolt from 3.22.0 to 4.2.0 in /examples/custom-receiver #456

Job	Run time
samples (18.x, slack-samples/bolt-ts-starter-template)	35s
examples (18.x, examples/getting-started-typescript)	38s
samples (18.x, slack-samples/bolt-ts-custom-function-template)	37s
examples (18.x, examples/custom-receiver)	36s
samples (20.x, slack-samples/bolt-ts-starter-template)	32s
examples (20.x, examples/getting-started-typescript)	31s
samples (20.x, slack-samples/bolt-ts-custom-function-template)	30s
examples (20.x, examples/custom-receiver)	38s
samples (22.x, slack-samples/bolt-ts-starter-template)	32s
examples (22.x, examples/getting-started-typescript)	36s
samples (22.x, slack-samples/bolt-ts-custom-function-template)	36s
examples (22.x, examples/custom-receiver)	35s
	6m 56s

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