Update Serilog dependency to 4.3.0

+semver: minor

GitOrigin-RevId: c041c589fbf44783abba154d917f005733938ba8

Author: Octobob

source/Octopus.Client.Tests/Octopus.Client.Tests.csproj

@@ -48,7 +48,7 @@
     <PackageReference Include="FluentAssertions" Version="6.12.2" />
     <PackageReference Include="Nancy" Version="2.0.0" />
     <PackageReference Include="NSubstitute" Version="5.3.0" />
-    <PackageReference Include="Serilog" Version="4.1.0" />
+    <PackageReference Include="Serilog" Version="4.3.0" />
     <PackageReference Include="Microsoft.AspNetCore.Owin" Version="2.1.1" />
     <PackageReference Include="Microsoft.AspNetCore.Server.Kestrel" Version="2.1.3" />
     <PackageReference Include="Microsoft.AspNetCore.Server.Kestrel.Https" Version="2.1.3" />