build(deps): bump Mindscape.Raygun4Net from 5.11.0 to 5.12.0 (#599)

Bumps [Mindscape.Raygun4Net](https://github.com/MindscapeHQ/raygun4net) from 5.11.0 to 5.12.0.
- [Release notes](https://github.com/MindscapeHQ/raygun4net/releases)
- [Commits](https://github.com/MindscapeHQ/raygun4net/commits)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

src/Splat.Raygun/Splat.Raygun.csproj

@@ -10,7 +10,7 @@
   </PropertyGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'NET461'">
-    <PackageReference Include="Mindscape.Raygun4Net" Version="5.11.0" />
+    <PackageReference Include="Mindscape.Raygun4Net" Version="5.12.0" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">