[Snyk] Security upgrade @slack/client from 4.0.0 to 4.5.0

[sillygwailo]

This PR was automatically created by Snyk using the credentials of a real user.

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 :-------------------------:|-------------------------|:-------------------------|:-------------------------|:-------------------------  | **556/1000**
**Why?** Recently disclosed, Has a fix available, CVSS 5.4 | Open Redirect
[SNYK-JS-GOT-2932019](https://snyk.io/vuln/SNYK-JS-GOT-2932019) | No | 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 216 commits.

• e95f59c Merge pull request #623 from aoberoi/rel-v4.5.0
• fde80c7 v4.5.0
• fc6371c Merge pull request #611 from clavin/issue-198-rtm-start-promise
• ddadd39 Make `disconnected` event arg more verbose
• 4ea73ad Merge pull request #620 from aoberoi/replace-got-with-axios
• df2786d add test for IncomingWebhook for failing with request error
• a917ec7 add test for agent option as boolean
• 8d9e24b add test for multiple custom agents by scheme
• 861305c add method description
• 40bb61c Replace dependency got with axios
• 050cbfa purge outdated comments
• d98aef7 Merge pull request #619 from DominikPalo/feature/dialog-state
• 7d01010 Add the "state" property to the dialog interface
• 3053334 Merge pull request #7 from slackapi/master
• b207d88 Merge pull request #613 from aoberoi/rel-v4.4.0
• 86d4727 v4.4.0
• da4b0ec Merge pull request #609 from aoberoi/user-data-api
• c1bdf0f grammar
• 4045fda add docs for on_behalf_of
• 5b0dddf convert user perspective option name from actor to on_behalf_of
• 92ea097 Add RTM start & disconnect Promises
• 07c174d Fix RTM `failure` event
• 7138b83 implement actor enabled methods, fixes #608
• 842c7a7 Merge pull request #605 from aoberoi/broad-types-node

See the full diff

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