[Snyk] Security upgrade axios from 0.20.0 to 0.21.1

[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:
  • backend/package.json
  • backend/package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	616/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 5.9	Server-Side Request Forgery (SSRF) SNYK-JS-AXIOS-1038255	No	Proof of Concept

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

Commit messages

Package name: axios

The new version differs by 18 commits.

• a64050a Releasing 0.21.1
• d57cd97 Updating changelog for 0.21.1 release
• 8b0f373 Use different socket for Win32 test (#3375)
• e426910 Protocol not parsed when setting proxy config from env vars (#3070)
• c7329fe Hotfix: Prevent SSRF (#3410)
• f472e5d Adding a type guard for `AxiosError` (#2949)
• 7688255 Remove the skipping of the `socket` http test (#3364)
• 820fe6e Updating axios in types to be lower case (#2797)
• 94ca24b Releasing 0.21.0
• 2130a0c Updating changelog for 0.21.0 release
• fbdc150 Lock travis to not use node v15 (#3361)
• 3a8b87d Fixing an issue that type 'null' and 'undefined' is not assignable to validateStatus when typescript strict option is enabled (#3200)
• 9a78465 Revert "Fixing overwrite Blob/File type as Content-Type in browser. (#1773)" (#3289)
• 6d05b96 Fix typos (#3309)
• fa36737 fix axios.delete ignores config.data (#3282)
• b7e954e Fixing node types (#3237)
• 04d45f2 Fixing requestHeaders.Authorization (#3287)
• e8c6e19 docs: Fix simple typo, existant -> existent (#3252)

See the full diff

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