Update dependency express-validator to v6.12.2

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
express-validator (source)	6.12.1 -> 6.12.2

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Release Notes

express-validator/express-validator

### [`v6.12.2`](https://togithub.com/express-validator/express-validator/releases/v6.12.2) [Compare Source](https://togithub.com/express-validator/express-validator/compare/v6.12.1...v6.12.2) ##### Fixes: - [#​1072](https://togithub.com/express-validator/express-validator/issues/1072): add type for `checkSchema` function return - [#​1092](https://togithub.com/express-validator/express-validator/issues/1092), [#​1086](https://togithub.com/express-validator/express-validator/issues/1086): correctly allow falsy values as options in `checkSchema`

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