chore(deps): update dependency tunit to 1.5.6 (#297)

This PR contains the following updates:

| Package | Change |
[Age](https://docs.renovatebot.com/merge-confidence/) |
[Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [TUnit](https://redirect.github.com/thomhurst/TUnit) | `1.5.1` ->
`1.5.6` |
![age](https://developer.mend.io/api/mc/badges/age/nuget/TUnit/1.5.6?slim=true)
|
![confidence](https://developer.mend.io/api/mc/badges/confidence/nuget/TUnit/1.5.1/1.5.6?slim=true)
|

---

### Release Notes

<details>
<summary>thomhurst/TUnit (TUnit)</summary>

###
[`v1.5.6`](https://redirect.github.com/thomhurst/TUnit/releases/tag/v1.5.6):
1.5.6

<!-- Release notes generated using configuration in .github/release.yml
at v1.5.6 -->

#### What's Changed

##### 🏕 Changes

- refactor: Consolidate initialisation logic by
[@&#8203;thomhurst](https://redirect.github.com/thomhurst) in
[#&#8203;4006](https://redirect.github.com/thomhurst/TUnit/pull/4006)
- feat: support class-level CombinedDataSources with static and method
data sources by
[@&#8203;thomhurst](https://redirect.github.com/thomhurst) in
[#&#8203;4007](https://redirect.github.com/thomhurst/TUnit/pull/4007)
- fix: improve exception messages for hook failures in HookExecutor by
[@&#8203;thomhurst](https://redirect.github.com/thomhurst) in
[#&#8203;4008](https://redirect.github.com/thomhurst/TUnit/pull/4008)

##### 👒 Dependencies

- chore(deps): update dependency nunit3testadapter to v6 by
[@&#8203;thomhurst](https://redirect.github.com/thomhurst) in
[#&#8203;4004](https://redirect.github.com/thomhurst/TUnit/pull/4004)

**Full Changelog**:
<thomhurst/TUnit@v1.5.1...v1.5.6>

</details>

---

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Directory.Packages.props

@@ -40,7 +40,7 @@
     <PackageVersion Include="SonarAnalyzer.CSharp" Version="10.16.1.129956" />
     <PackageVersion Include="StyleCop.Analyzers" Version="1.2.0-beta.556" />
     <PackageVersion Include="Testcontainers.MsSql" Version="4.9.0" />
-    <PackageVersion Include="TUnit" Version="1.5.1" />
+    <PackageVersion Include="TUnit" Version="1.5.6" />
     <PackageVersion Include="Verify.TUnit" Version="31.8.0" />
   </ItemGroup>
 </Project>