[Snyk] Security upgrade undici from 6.21.0 to 6.21.1

[jshemas]

Snyk has created this PR to fix 1 vulnerabilities in the npm dependencies of this project.

Snyk changed the following file(s):

• package.json
• package-lock.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Insecure Randomness SNYK-JS-UNDICI-8641354	763

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• Max score is 1000. Note that the real score may have changed since the PR was raised.
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