build(deps): Bump Serilog.Expressions from 3.4.1 to 4.0.0 (#1265)

Bumps [Serilog.Expressions](https://github.com/serilog/serilog-expressions) from 3.4.1 to 4.0.0.
- [Release notes](https://github.com/serilog/serilog-expressions/releases)
- [Commits](serilog/serilog-expressions@v3.4.1...v4.0.0)

---
updated-dependencies:
- dependency-name: Serilog.Expressions
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

tests/bunit.testassets/bunit.testassets.csproj

@@ -14,7 +14,7 @@
 
 	<ItemGroup>
 		<PackageReference Include="Serilog" Version="3.1.1" />
-		<PackageReference Include="Serilog.Expressions" Version="3.4.1" />
+		<PackageReference Include="Serilog.Expressions" Version="4.0.0" />
 		<PackageReference Include="xunit.extensibility.execution" Version="2.5.2" />
 		<PackageReference Include="xunit.abstractions" Version="2.0.3" />
 		<PackageReference Include="xunit.assert" Version="2.6.1" />