build(deps): bump chart.js from 2.9.3 to 2.9.4 in /frontend

[dependabot[bot]]

Bumps chart.js from 2.9.3 to 2.9.4.

Release notes

Sourced from chart.js's releases.

v2.9.4

This is the last release of v2 and focused on fixing bugs identified in the v2.9.3 release.

Bugs Fixed

• #7404 - Preserve prototypes when cloning. Thanks @​iddings
• #7587 - Fix docs for external moment.js. Thanks @​mojoaxel
• #7853 - Fix box recursion when dimensions are NaN. Thanks @​alessandroasm
• #7883 - Fix call stack exception when computing label sizes. Thanks @​silentmatt
• #7918 - Prevent global prototype pollution via the merge helper
• #7920 - Use Object.create(null) as merge target, to prevent prototype pollution

Commits

• 9bd4cf8 Release v2.9.4
• 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 full diff in compare view

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[dependabot[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.