[Snyk] Security upgrade chart.js from 2.7.1 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:
  • package.json
  • 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 250 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)
• 26ea9f0 Update version number to 2.9.3 (#6725)
• a307a2a Don't make legend empty when fill is false (#6719)
• c44229f Fix undefined variable (#6698)
• a985fec Stop unnecessary line calculations (#6671)
• 1cce8a5 Backward compatible default `fill` for radar charts (#6655)
• a920bfe Hide correct dataset from legend (#6661)
• 201fe46 Versatile clipping for lines (#6660)
• ad26311 Refresh package-lock to pick up new version of chartjs-colors (#6663)
• 8abfbcb Update version number to v2.9.2 (#6657)
• 45550ed Combine performance docs (#6643)
• 65421bb Use `document` when `getRootNode` is unsupported (#6641)
• a92dd7b Release v2.9.1 (#6618)
• 26b9d1f Merge pull request #6601 from chartjs/master
• ea100d4 Bump version number to 2.9.0 (#6600)
• 333118b Hover styling for dataset in 'dataset' mode (#6527)

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