chore(deps): update dependency @slack/client to v4.9.0 - autoclosed

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
@​slack/client	dependencies	minor	4.3.1 -> 4.9.0	source

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Release Notes

slackapi/node-slack-sdk

v4.9.0

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v4.8.0

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New Features

• The IncomingWebhook constructor now has an agent option. It works exactly like the agent option from WebClient. It's very useful for setting a proxy for requests using packages like https-proxy-agent or tunnel. Thanks @​romanbalayan (#​640)

Documentation improvements

• Fixes the TypeScript lib configuration instructions for versions 3.1 and above. Thanks @​melisdogan (#​650).

v4.7.0

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New Features

• You can now specify HTTP headers you'd like to include on all requests from WebClient. Just pass a headers option to the constructor. Thanks @​ethan0920 (#​629).

Bug fixes

• Fixes a bug when specifying the agent option on WebClient using an agent from https-proxy-agent. Thanks @​aoberoi (#​645).

Documentation improvements

• Fixes pagination sample code. Thanks @​smaeda-ks (#​641).

• Adds missing WebClient instance in the Getting Started guide. Thanks @​jharrilim (#​637).

• Adds documentation for using the package within a TypeScript project - see https://slackapi.github.io/node-slack-sdk/typescript. Thanks @​aoberoi (#​644).

• Clarifies usage of Web API methods with no required options using callbacks. Thanks @​aoberoi (#​631).

v4.6.0

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New Features

• Adds support for short lived tokens and automatic token refresh (#​617) - thanks @​aoberoi and @​shanedewael

v4.5.0

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New Features

• RTMClient.start() now returns a Promise that resolves with the data emitted with the authenticated event - thanks @​clavin (#​611)
• Adds the state property to the type definition of Dialog - thanks @​DominikPalo (#​619)

Bug Fixes

• Fixes an issue where RTMClient did not emit the "disconnected" event when it fails to connect - thanks @​clavin (#​610)

Other

• Replaces the got dependency with axios - thanks @​aoberoi (#​620)

v4.4.0

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New Features

• Workspace apps can now call methods on behalf of users for methods which require the X-Slack-User header. When
  calling one of these methods, specify the user ID in the new on_behalf_of option. - thanks @​aoberoi (#​609)
• The new rejectRateLimitedCalls option in the WebClient constructor allows you to customize how you'd like to handle
  rate limiting. If you set it to true, the WebClient will not attempt to retry an API call for you, and will instead
  return an error with a code property set to the value ErrorCode.RateLimitedError. - thanks @​aoberoi (#​599)
• Automatic pagination for cursor-based pagination enabled methods: It's always recommended to perform
  pagination using the cursor and limit options directly, but if you don't pass either when calling a method, the
  WebClient will automatically iterate through all the pages and returned a merged result. - thanks @​aoberoi (#​596)
• The WebClient will warn when calling deprecated methods (files.comments.add and files.comments.edit) - thanks @​aoberoi (#​604)

Bug fixes and more

• Fixes the crash when RTMClient#disconnect() was called from the connecting state - thanks @​aoberoi (#​603)
• Fixes an issue where uploading a file without a token fails in WebClient with an unrelated error - thanks @​aoberoi (#​587)
• Resolves an issue where your app requires a newer version of @types/node than this package specifies - thanks @​aoberoi (#​605)
• Fixes the Dialog.selected_options type definition - thanks @​harveyr (#​588)
• Adds information, fixes syntax issues, and corrects typos in the documentation - thanks @​chris-peterson, @​jd0920 (#​584, #​600, #​601)
• Tests against node v10 in Travis - thanks @​aoberoi (#​606)

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