[Snyk] Security upgrade chart.js from 2.9.3 to 2.9.4

[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:
  • frontend/package.json
  • frontend/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	Prototype Pollution SNYK-JS-CHARTJS-1018716	No	Proof of Concept

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

Commit messages

Package name: chart.js

The new version differs by 9 commits.

• 1d92605 Use Object.create(null) as `merge` target (#7920)
• dff7140 When objects are merged together, the target prototype can be polluted. (#7918)
• d919188 Bump verison number to v2.9.4
• 42ed589 Fix Maximum call stack size exception in computeLabelSizes (#7883)
• 063b7dc [2.9] FitBoxes recursion when dimensions are NaN (#7853)
• 2493cb5 Use node v12.18.2 on Travis CI (#7864)
• 679ec4a docs: fix rollup external moment (#7587)
• 484f0d1 Preserve object prototypes when cloning (#7404)
• 2df6986 Look for any branch starting with release (#7087) (#7089)

See the full diff

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