fix(deps): Update dependency @grpc/grpc-js to v1.10.8 (#168)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [@grpc/grpc-js](https://grpc.io/) ([source](https://togithub.com/grpc/grpc-node)) | dependencies | patch | [`1.10.6` -> `1.10.8`](https://renovatebot.com/diffs/npm/@grpc%2fgrpc-js/1.10.6/1.10.8) |

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### Release Notes

<details>
<summary>grpc/grpc-node (@&#8203;grpc/grpc-js)</summary>

### [`v1.10.8`](https://togithub.com/grpc/grpc-node/releases/tag/%40grpc/grpc-js%401.10.8): @&#8203;grpc/grpc-js 1.10.8

[Compare Source](https://togithub.com/grpc/grpc-node/compare/@grpc/grpc-js@1.10.7...@grpc/grpc-js@1.10.8)

-   Fix a bug that caused channels with `unix:` targets to not reconnect after the channel goes idle ([#&#8203;2750](https://togithub.com/grpc/grpc-node/issues/2750))

### [`v1.10.7`](https://togithub.com/grpc/grpc-node/releases/tag/%40grpc/grpc-js%401.10.7): @&#8203;grpc/grpc-js 1.10.7

[Compare Source](https://togithub.com/grpc/grpc-node/compare/@grpc/grpc-js@1.10.6...@grpc/grpc-js@1.10.7)

-   Improve reporting of HTTP error codes ([#&#8203;2723](https://togithub.com/grpc/grpc-node/issues/2723))
-   Update dependency on `@grpc/proto-loader` to the latest version ([#&#8203;2732](https://togithub.com/grpc/grpc-node/issues/2732))

</details>

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