chore(deps): update dependency com_google_protobuf to v3.15.1 (#539)
chore(deps): update dependency com_google_protobuf to v3.15.1 (#539)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [com_google_protobuf](https://togithub.com/protocolbuffers/protobuf) | http_archive | patch | `v3.15.0` -> `v3.15.1` |

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### Release Notes

<details>
<summary>protocolbuffers/protobuf</summary>

### [`v3.15.1`](https://togithub.com/protocolbuffers/protobuf/releases/v3.15.1)

[Compare Source](https://togithub.com/protocolbuffers/protobuf/compare/v3.15.0...v3.15.1)

### Ruby

-   Bugfix for Message.\[] for repeated or map fields ([#&#8203;8313](https://togithub.com/protocolbuffers/protobuf/issues/8313))
-   Fix for truncating behavior when converting Float to Duration ([#&#8203;8320](https://togithub.com/protocolbuffers/protobuf/issues/8320))

### C++

-   Small fixes for MinGW and for C++20 with GCC ([#&#8203;8318](https://togithub.com/protocolbuffers/protobuf/issues/8318))

</details>

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