[Snyk] Security upgrade @slack/client from 4.12.0 to 5.0.0

[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
	768/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 7.5	Regular Expression Denial of Service (ReDoS) SNYK-JS-AXIOS-1579269	Yes	Proof of Concept

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

Commit messages

Package name: @slack/client

The new version differs by 250 commits.

• 891307e Publish
• 55624fd lerna generated SHAs
• a76b3ee Merge pull request #756 from slackapi/dev-v5
• 09d6d6f fix a typescript issue from changing from type aliases to interfaces
• 4d3133c remove package locks from examples
• c3e5c8b update examples for testing
• d40c883 remove file accidentally added in merge
• 0d1cd79 Merge branch 'master' into dev-v5
• b6dc555 Merge pull request #755 from aoberoi/find-and-replace
• 65788d2 Merge pull request #754 from shanedewael/local-development-tutorial
• 81be95b its amazing what you can find with a little find and replace
• 8c98232 Consolidate cta
• 53861c9 Update docs/_tutorials/local_development.md
• 74b8e77 Update docs/_tutorials/local_development.md
• 200a430 Update docs/_tutorials/local_development.md
• 95cd749 Changes
• 2ee0224 Merge pull request #752 from aoberoi/scheduled-messages-v5
• 695984a Merge pull request #753 from aoberoi/issue-templates-v5
• aa126f0 Merge pull request #751 from aoberoi/reference-examples
• 5f7a654 Add table of contents
• e73ad7d Fix links on READMEs
• d1eb873 Local development tutorial
• 17318b2 add warning to maintainers guide
• dd84a72 update issue template to ask for relevant packages

See the full diff

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