build(deps): bump Serilog.Exceptions in /src

Bumps [Serilog.Exceptions](https://github.com/RehanSaeed/Serilog.Exceptions) from 8.3.0 to 8.4.0+build.694.
- [Release notes](https://github.com/RehanSaeed/Serilog.Exceptions/releases)
- [Commits](RehanSaeed/Serilog.Exceptions@8.3.0...8.4.0)

---
updated-dependencies:
- dependency-name: Serilog.Exceptions
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

src/Splat.Tests/Splat.Tests.csproj

@@ -9,7 +9,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Serilog.Exceptions" Version="8.3.0" />
+    <PackageReference Include="Serilog.Exceptions" Version="8.4.0+build.694" />
   </ItemGroup>
 
   <ItemGroup>