[Snyk] Upgrade @tensorflow/tfjs from 3.18.0 to 3.21.0

[perploug]

This PR was automatically created by Snyk using the credentials of a real user.

Snyk has created this PR to upgrade @tensorflow/tfjs from 3.18.0 to 3.21.0.

:information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 3 versions ahead of your current version.
• The recommended version was released 4 months ago, on 2022-10-06.

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