Update dependency com.kreait.slack:slack-jackson-dto-test to v2

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.kreait.slack:slack-jackson-dto-test (source)	1.0.0 -> 2.0.0

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Release Notes

kreait/slack-spring-boot-starter

### [`v2.0.0`](https://togithub.com/kreait/slack-spring-boot-starter/blob/HEAD/CHANGELOG.md#​200---2020-08-26) - Added Pins API methods - Added JsonIgnore on unknown properties to DTOs - Unified Message objects into one - Added app_home_opened event - Added subteam_created event - Added subteam_members_changed event - Added team_join event - Added user_change event - Introdced Instant Type mapping in UserGroup - Added TypedEventReceiver to make generic event type mapping possible - Added various sample methods for testing

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Configuration

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