[Snyk] Security upgrade axios from 0.20.0 to 0.21.3

[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
	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	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 57 commits.

• e367be5 [Releasing] 0.21.3
• 83ae383 Correctly add response interceptors to interceptor chain (#4013)
• c0c8761 [Updating] changelog to include links to issues and contributors
• 619bb46 [Releasing] v0.21.2
• 82c9455 Create SECURITY.md (#3981)
• 5b45711 Security fix for ReDoS (#3980)
• 5bc9ea2 Update ECOSYSTEM.md (#3817)
• e72813a Fixing README.md (#3818)
• e10a027 Fix README typo under Request Config (#3825)
• e091491 Update README.md (#3936)
• b42fbad Removed un-needed bracket
• 520c8dc Updating CI status badge (#3953)
• 4fbeecb Adding CI on Github Actions. (#3938)
• e9965bf Fixing the sauce labs tests (#3813)
• dbc634c Remove charset in tests (#3807)
• 3958e9f Add explanation of cancel token (#3803)
• 69949a6 Adding custom return type support to interceptor (#3783)
• 49509f6 Create FUNDING.yml (#3796)
• 199c8aa Adding parseInt to config.timeout (#3781)
• 94fc4ea Adding isAxiosError typeguard documentation (#3767)
• 0ece97c Fixing quadratic runtime when setting a maxContentLength (#3738)
• a18a0ec Updating `lib/core/README.md` about Dispatching requests (#3772)
• 59fa614 [Updated] follow-redirects to the latest version (#3771)
• 7821ed2 Feat/json improvements (#3763)

See the full diff

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