chore(deps): update dependency grpc/grpc-swift-protobuf to v1.3.1 (#1691)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
|
[grpc/grpc-swift-protobuf](https://redirect.github.com/grpc/grpc-swift-protobuf)
| patch | `1.3.0` -> `1.3.1` |

---

### Release Notes

<details>
<summary>grpc/grpc-swift-protobuf (grpc/grpc-swift-protobuf)</summary>

###
[`v1.3.1`](https://redirect.github.com/grpc/grpc-swift-protobuf/releases/tag/1.3.1)

[Compare
Source](https://redirect.github.com/grpc/grpc-swift-protobuf/compare/1.3.0...1.3.1)

<!-- Release notes generated using configuration in .github/release.yml
at release/1.x -->

#### What's Changed

##### SemVer Patch

- Add deprecation warnings by
[@&#8203;glbrntt](https://redirect.github.com/glbrntt) in
[https://github.com/grpc/grpc-swift-protobuf/pull/72](https://redirect.github.com/grpc/grpc-swift-protobuf/pull/72)

**Full Changelog**:
grpc/grpc-swift-protobuf@1.3.0...1.3.1

</details>

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examples/grpc_example/Package.resolved

@@ -6,7 +6,7 @@ let package = Package(
     name: "grpc_example",
     dependencies: [
         .package(url: "https://github.com/grpc/grpc-swift.git", exact: "2.2.3"),
-        .package(url: "https://github.com/grpc/grpc-swift-protobuf.git", exact: "1.3.0"),
+        .package(url: "https://github.com/grpc/grpc-swift-protobuf.git", exact: "1.3.1"),
         .package(url: "https://github.com/grpc/grpc-swift-nio-transport.git", exact: "1.2.3"),
         .package(url: "https://github.com/apple/swift-protobuf.git", exact: "1.30.0"),
     ]