build(deps): bump NLog from 4.5.7 to 4.6.5 (#343)

Bumps [NLog](https://github.com/NLog/NLog) from 4.5.7 to 4.6.5.
- [Release notes](https://github.com/NLog/NLog/releases)
- [Changelog](https://github.com/NLog/NLog/blob/dev/CHANGELOG.md)
- [Commits](NLog/NLog@v4.5.7...v4.6.5)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

src/Splat.NLog/Splat.NLog.csproj

@@ -9,7 +9,7 @@
     <PackageId>Splat.NLog</PackageId>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="NLog" Version="4.5.7" />
+    <PackageReference Include="NLog" Version="4.6.5" />
     <PackageReference Include="System.Collections.Immutable" Version="1.5.0" />
   </ItemGroup>
   <ItemGroup>