[Snyk] Security upgrade @slack/client from 3.16.0 to 4.0.0

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	584/1000 Why? Has a fix available, CVSS 7.4	Regular Expression Denial of Service (ReDoS) SNYK-JS-HAWK-2808852	Yes	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: @slack/client

The new version differs by 65 commits.

• ce06b1e Merge pull request SlackBot#send() support for a callback function slackapi/hubot-slack#473 from slackapi/dev-v4
• cbd9d21 Merge branch 'master' into dev-v4
• 8fac7d5 v4.0.0
• b4f4f8b generate documentation
• fa70a8d IncomingWebhook implementation
• d621134 remove examples dir, export declaration files
• 81d9b04 updates readme and guides for new API
• 8db2e2c updates documentation generation instructions
• fdf7b51 update finity, remove superfluous comments from jsdoc
• 45cf343 basic doc generation is working
• 8e4ae7e Merge branch 'dev-v4' into ts2jsdoc
• 4ae19d5 adds TLSOptions, new RTMClient events for parity
• cae00fa POC
• abe015b adds migration guide content for WebClient
• b8b4c63 code organization and pulling out comments to build the migration guide
• f25a6a8 implements loglevel plugin API to prefix messages with log level and logger name
• 0a325ee rename keep-alive.ts -> KeepAlive.ts
• 4e16be2 implement configurable replyAckOnReconnectTimeout in RTMClient
• 5185e5e rtm message sending based on a queue for outgoing messages and cancelable promises for replies
• 662a577 a basic echo program using rtm works! tweaked keepalive and integrated into rtmclient
• dc59265 RTMClient connects! implemented connecting state in statemachine with substate transitions. commented out KeepAlive for simplicity while refactoring, but will re-enable soon.
• f28d69d adds stronger definition for errors from WebClient and uses this information in RTMClient
• ec91168 simplify statemachine config functions by removing RTMClientStateMachine interface extension
• cbaf7a1 an early state machine implementation for the RTM client

See the full diff

Check the changes in this PR to ensure they won't cause issues with your project.

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