fix(deps): Update dependency grpc-tools to v1.13.0 (#90)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [grpc-tools](https://grpc.io/) ([source](https://redirect.github.com/grpc/grpc-node)) | devDependencies | minor | [`1.12.4` -> `1.13.0`](https://renovatebot.com/diffs/npm/grpc-tools/1.12.4/1.13.0) |

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### Release Notes

<details>
<summary>grpc/grpc-node (grpc-tools)</summary>

### [`v1.13.0`](https://redirect.github.com/grpc/grpc-node/compare/[email protected])

[Compare Source](https://redirect.github.com/grpc/grpc-node/compare/[email protected])

</details>

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