chore(deps): update dependency grpc-tools to v1.12.3

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
grpc-tools (source)	1.12.1 -> 1.12.3

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Release Notes

grpc/grpc-node

### [`v1.12.3`](https://togithub.com/grpc/grpc-node/releases/tag/v1.12.3): Node gRPC v1.12.3 [Compare Source](https://togithub.com/grpc/grpc-node/compare/grpc-tools@1.12.2...v1.12.3) Node changes: - Fix client interceptor handling in generic client method calls ([#​385](https://togithub.com/grpc/grpc-node/issues/385)) ### [`v1.12.2`](https://togithub.com/grpc/grpc-node/releases/tag/grpc-tools%401.12.2): grpc-tools 1.12.2 [Compare Source](https://togithub.com/grpc/grpc-node/compare/grpc-tools@1.12.1...grpc-tools@1.12.2) - Target an older Mac version when building Mac artifacts ([#​2290](https://togithub.com/grpc/grpc-node/issues/2290))

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