bump axios to v0.21.1 to fix vuln (CVE-2020-28168)

[brendan-miller-snyk]

Summary

Issue: #721

Axios NPM package <=0.21.0 contains a Server-Side Request Forgery (SSRF) vulnerability where an attacker is able to bypass a proxy by providing a URL that responds with a redirect to a restricted host or IP address.

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	Exploit Maturity
	402/1000 Why? Proof of Concept exploit, CVSS 5.9 - https://app.snyk.io/test/npm/@slack/bolt/2.5.0	Server-Side Request Forgery (SSRF) SNYK-JS-AXIOS-1038255	Proof of Concept

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Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #722 (df2b579) into main (305ae9a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #722   +/-   ##
=======================================
  Coverage   82.32%   82.32%           
=======================================
  Files           8        8           
  Lines         758      758           
  Branches      250      250           
=======================================
  Hits          624      624           
  Misses         78       78           
  Partials       56       56           

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[seratch]

Thanks for taking time to report this issue and send this fix! LGTM 👍 This will be merged on Monday, Pacific Time.

[brendan-miller-snyk]

No worries! Appreciate the quick turnaround 👍