Update dependency com.slack.eithernet:eithernet to v1.6.0 (#904)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[com.slack.eithernet:eithernet](https://togithub.com/slackhq/eithernet)
| dependencies | minor | `1.5.0` -> `1.6.0` |

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### Release Notes

<details>
<summary>slackhq/eithernet (com.slack.eithernet:eithernet)</summary>

###
[`v1.6.0`](https://togithub.com/slackhq/eithernet/blob/HEAD/CHANGELOG.md#160)

[Compare
Source](https://togithub.com/slackhq/eithernet/compare/1.5.0...1.6.0)

*2023-09-26*

- **Enhancement**: Add `shouldRetry` parameter to
`retryWithExponentialBackoff()` to allow conditional short-circuiting of
retries.

</details>

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gradle/libs.versions.toml

@@ -28,7 +28,7 @@ datastore = "1.1.0-alpha05"
 dependencyAnalysisPlugin = "1.22.0"
 detekt = "1.23.1"
 dokka = "1.9.0"
-eithernet = "1.5.0"
+eithernet = "1.6.0"
 jdk = "20"
 kotlin = "1.9.10"
 kotlinpoet = "1.14.2"