Update dependency SixLabors.ImageSharp to 3.1.6 (#8)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [SixLabors.ImageSharp](https://github.com/SixLabors/ImageSharp) | nuget | patch | `3.1.5` -> `3.1.6` |

---

### Release Notes

<details>
<summary>SixLabors/ImageSharp (SixLabors.ImageSharp)</summary>

### [`v3.1.6`](https://github.com/SixLabors/ImageSharp/releases/tag/v3.1.6)

#### What's Changed

-   Mono AOT decoder workaround for slow jpeg decoding. by [@&#8203;JimBobSquarePants](https://github.com/JimBobSquarePants) in https://github.com/SixLabors/ImageSharp/pull/2762
-   V3 - Correctly handle transform spaces when building transform matrices. by [@&#8203;JimBobSquarePants](https://github.com/JimBobSquarePants) in https://github.com/SixLabors/ImageSharp/pull/2791
-   Backport : V3 Fix [#&#8203;2779](https://github.com/SixLabors/ImageSharp/issues/2779) buffer overrun by [@&#8203;JimBobSquarePants](https://github.com/JimBobSquarePants) in https://github.com/SixLabors/ImageSharp/pull/2824
-   Backport - v3 WEBP : Use Correct Width With AlphaDecoder by [@&#8203;JimBobSquarePants](https://github.com/JimBobSquarePants) in https://github.com/SixLabors/ImageSharp/pull/2827
-   Rewrite ChunkedMemoryStream by [@&#8203;JimBobSquarePants](https://github.com/JimBobSquarePants) in https://github.com/SixLabors/ImageSharp/pull/2828

**Full Changelog**: https://github.com/SixLabors/ImageSharp/compare/v3.1.5...v3.1.6

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Enabled.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNy40MjAuMSIsInVwZGF0ZWRJblZlciI6IjM5LjMwLjAiLCJ0YXJnZXRCcmFuY2giOiJtYWluIiwibGFiZWxzIjpbXX0=-->

Reviewed-on: https://git.cantorgymnasium.de/gcg/photomator/pulls/8
Co-authored-by: Renovate Bot <renovate-bot@git.cantorgymnasium.de>
Co-committed-by: Renovate Bot <renovate-bot@git.cantorgymnasium.de>

Photomator/Photomator.csproj

@@ -15,7 +15,7 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
-    <PackageReference Include="SixLabors.ImageSharp" Version="3.1.5" />
+    <PackageReference Include="SixLabors.ImageSharp" Version="3.1.6" />
   </ItemGroup>
 
   <Target Name="PreBuild" BeforeTargets="PreBuildEvent">