chore(deps): update nest monorepo to v7.6.4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@nestjs/common (source)	7.6.2 -> 7.6.4
@nestjs/core (source)	7.6.2 -> 7.6.4
@nestjs/platform-express (source)	7.6.2 -> 7.6.4
@nestjs/testing (source)	7.6.2 -> 7.6.4

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Release Notes

nestjs/nest

### [`v7.6.4`](https://togithub.com/nestjs/nest/compare/v7.6.3...v7.6.4) [Compare Source](https://togithub.com/nestjs/nest/compare/v7.6.3...v7.6.4) ### [`v7.6.3`](https://togithub.com/nestjs/nest/compare/v7.6.2...v7.6.3) [Compare Source](https://togithub.com/nestjs/nest/compare/v7.6.2...v7.6.3)

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