chore(deps): update dependency envalid to v8

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
envalid	7.x.x -> 8.x
envalid	^7.3.1 -> ^8.0.0

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Release Notes

af/envalid (envalid)

### [`v8.0.0`](https://redirect.github.com/af/envalid/releases/tag/v8.0.0) [Compare Source](https://redirect.github.com/af/envalid/compare/v7.3.1...v8.0.0) 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](https://redirect.github.com/af/envalid/issues/194). Overall the type inference and accuracy should be improved - Dev dependencies have been updated - Add extra "inspectables" ([#​206](https://redirect.github.com/af/envalid/issues/206)) - fix testOnly behavior ([#​200](https://redirect.github.com/af/envalid/issues/200))

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