Update Rust crate httpmock to 0.6.8 (#28)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [httpmock](https://togithub.com/alexliesenfeld/httpmock) | workspace.dependencies | patch | `0.6.7` -> `0.6.8` |

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### Release Notes

<details>
<summary>alexliesenfeld/httpmock (httpmock)</summary>

### [`v0.6.8`](https://togithub.com/alexliesenfeld/httpmock/blob/HEAD/CHANGELOG.md#Version-068)

[Compare Source](https://togithub.com/alexliesenfeld/httpmock/compare/v0.6.7...v0.6.8)

-   This is a maintenance release that updates all dependencies to the most recent version.
-   Fixes some dependency issues with the Docker image.

</details>

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Cargo.lock

@@ -94,7 +94,7 @@ dialoguer = "0.10.3"
 dunce = "1.0.4"
 futures = "0.3.28"
 futures-retry = "0.6.0"
-httpmock = { version = "0.6.7", default-features = false }
+httpmock = { version = "0.6.8", default-features = false }
 indexmap = "1.9.2"
 indicatif = "0.17.3"
 indoc = "2.0.0"