Bump SixLabors.ImageSharp from 3.1.11 to 3.1.12 (#2804)

Updated [SixLabors.ImageSharp](https://github.com/SixLabors/ImageSharp)
from 3.1.11 to 3.1.12.

<details>
<summary>Release notes</summary>

_Sourced from [SixLabors.ImageSharp's
releases](https://github.com/SixLabors/ImageSharp/releases)._

## 3.1.12

## What's Changed
* v3 : Add Full Metadata Parsing for WEBP Animations by
@​JimBobSquarePants in SixLabors/ImageSharp#3002
* V3: Prevent negative allocation attempt for huge TIFF files by
@​JimBobSquarePants in SixLabors/ImageSharp#3004
* Backport v3 : Tiff decoder: Fix issue 2679 by @​JimBobSquarePants in
SixLabors/ImageSharp#3007


**Full Changelog**:
SixLabors/ImageSharp@v3.1.11...v3.1.12

Commits viewable in [compare
view](SixLabors/ImageSharp@v3.1.11...v3.1.12).
</details>

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ImperatorToCK3/ImperatorToCK3.csproj

@@ -51,7 +51,7 @@
             <PrivateAssets>all</PrivateAssets>
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         </PackageReference>
-        <PackageReference Include="SixLabors.ImageSharp" Version="3.1.11" />
+        <PackageReference Include="SixLabors.ImageSharp" Version="3.1.12" />
         <PackageReference Include="ZLinq" Version="1.5.3" />
     </ItemGroup>