chore(grpc-ts-health-check): pin @grpc/proto-loader ^0.7.2

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@grpc/proto-loader (source)	^0.7.0 -> ^0.7.2

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Release Notes

grpc/grpc-node

### [`v0.7.2`](https://togithub.com/grpc/grpc-node/releases/tag/%40grpc%2Fproto-loader%400.7.2) [Compare Source](https://togithub.com/grpc/grpc-node/compare/@grpc/proto-loader@0.7.1...@grpc/proto-loader@0.7.2) - Revert upgrade of `long` dependency ([#​2197](https://togithub.com/grpc/grpc-node/issues/2197)) ### [`v0.7.1`](https://togithub.com/grpc/grpc-node/releases/tag/%40grpc%2Fproto-loader%400.7.1) - Update `long` dependency to version 5 ([#​2192](https://togithub.com/grpc/grpc-node/issues/2192))

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