Update dependency envalid to v8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
envalid	^7.3.1 -> ^8.0.0

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Release Notes

af/envalid (envalid)

v8.0.0

Compare Source

After a long wait, version 8 is here!

• Despite the major version bump, the only potentially breaking changes are in the types (if you're using TypeScript), as a result of #​194. Overall the type inference and accuracy should be improved
• Dev dependencies have been updated
• Add extra "inspectables" (#​206)
• fix testOnly behavior (#​200)

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