Bump NLog from 6.1.2 to 6.1.3 (#91)

Updated [NLog](https://github.com/NLog/NLog) from 6.1.2 to 6.1.3.

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

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

## 6.1.3

**Improvements**
- #​6168 PropertiesDictionary - Preserve MessageTemplate property
details when adding extra properties. (@​snakefoot)
- #​6149 LoggingRule - Updating FinalMinLevel should also update
MinLevel when same LogLevel. (@​snakefoot)
- #​6165 AsyncTaskTarget - Retry with help from Task.Delay.
(@​snakefoot)
- #​6164 DateLayoutRenderer - UniversalTime = false should only convert
to local when UTC. (@​snakefoot)
- #​6138 SimpleLayout skip Precalculate when
INoAllocationStringValueRenderer available. (@​reabr)
- #​6158 TemplateEnumerator - Optimize ParseTextPart by direct calling
IndexOfAny. (@​snakefoot)
- #​6152 TemplateEnumerator - Optimize parsing of single digit holename.
(@​snakefoot)
- #​6142 InternalLogger - Skip allocating params array when no
exception. (@​snakefoot)
- #​6145 InternalLogger - Handle Exception ToString can throw with AOT.
(@​snakefoot)
- #​6154 ColoredConsoleTarget - Optimize Console Coloring for Word
Highlight. (@​snakefoot)
- #​6159 ColoredConsoleTarget - Reset capture of previous colors after
ResetDefaultColors. (@​snakefoot)
- #​6140 TryParseEnum - Apply Enum.TryParse since better for AOT.
(@​snakefoot)
- #​6143 Fixed various issues reported by EnableNETAnalyzers.
(@​snakefoot)

Commits viewable in [compare
view](NLog/NLog@v6.1.2...v6.1.3).
</details>

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WatermarkStamper/WatermarkStamper.csproj

@@ -127,7 +127,7 @@
       <Version>13.0.4</Version>
     </PackageReference>
     <PackageReference Include="NLog">
-      <Version>6.1.2</Version>
+      <Version>6.1.3</Version>
     </PackageReference>
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />