chore(deps): update dependency soto-project/soto to from: "7.8.0" (#1728)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [soto-project/soto](https://redirect.github.com/soto-project/soto) |
minor | `from: "7.7.0"` -> `from: "7.8.0"` |

---

### Release Notes

<details>
<summary>soto-project/soto (soto-project/soto)</summary>

###
[`v7.8.0`](https://redirect.github.com/soto-project/soto/releases/tag/7.8.0)

[Compare
Source](https://redirect.github.com/soto-project/soto/compare/7.7.0...7.8.0)

Using soto-core
[v7.8.0](https://redirect.github.com/soto-project/soto-core/releases/tag/7.8.0)

#### Patch release changes

- Push attribute to stack for custom dynamodb date decoding.
[#&#8203;775](https://redirect.github.com/soto-project/soto/issues/775)

#### Other changes

- Build service files from model files found in
[api-models-aws.git](https://redirect.github.com/aws/api-models-aws).
[#&#8203;771](https://redirect.github.com/soto-project/soto/issues/771)
- Remove models folder from Soto, replace with file containing commit
hash of models that built the current service files.
[#&#8203;771](https://redirect.github.com/soto-project/soto/issues/771)

</details>

---

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examples/soto_example/Package.resolved

@@ -5,6 +5,6 @@ import PackageDescription
 let package = Package(
     name: "PhoneNumberKitExample",
     dependencies: [
-        .package(url: "https://github.com/soto-project/soto.git", from: "7.7.0"),
+        .package(url: "https://github.com/soto-project/soto.git", from: "7.8.0"),
     ]
 )