fix(deps): Update dependency grpcio to v1.56.2 (#8)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [grpcio](https://grpc.io) ([source](https://togithub.com/grpc/grpc)) | patch | `==1.56.0` -> `==1.56.2` |

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### Release Notes

<details>
<summary>grpc/grpc (grpcio)</summary>

### [`v1.56.2`](https://togithub.com/grpc/grpc/releases/tag/v1.56.2)

[Compare Source](https://togithub.com/grpc/grpc/compare/v1.56.0...v1.56.2)

This is release gRPC Core 1.56.2 (galvanized).

For gRPC documentation, see [grpc.io](https://grpc.io/). For previous releases, see [Releases](https://togithub.com/grpc/grpc/releases).

This release contains refinements, improvements, and bug fixes.

## Core

-   \[WRR] backport ([#&#8203;33694](https://togithub.com/grpc/grpc/pull/33694)) to 1.56 ([#&#8203;33698](https://togithub.com/grpc/grpc/pull/33698))

-   \[backport]\[iomgr]\[EventEngine] Improve server handling of file descriptor exhaustion ([#&#8203;33667](https://togithub.com/grpc/grpc/pull/33667))

</details>

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Author: cq-bot

requirements.txt

@@ -1,6 +1,6 @@
 black==23.7.0
 grpcio-tools==1.56.0
-grpcio==1.56.0
+grpcio==1.56.2
 protobuf==4.23.4
 pyarrow==12.0.1
 pytest==7.4.0