Bump Microsoft.FeatureManagement from 3.1.1 to 4.0.0

Bumps [Microsoft.FeatureManagement](https://github.com/microsoft/FeatureManagement-Dotnet) from 3.1.1 to 4.0.0.
- [Release notes](https://github.com/microsoft/FeatureManagement-Dotnet/releases)
- [Commits](microsoft/FeatureManagement-Dotnet@3.1.1...4.0.0)

---
updated-dependencies:
- dependency-name: Microsoft.FeatureManagement
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

LearningHub.Nhs.WebUI/LearningHub.Nhs.WebUI.csproj

@@ -122,7 +122,7 @@
 
 		<PackageReference Include="Microsoft.Azure.Management.Media" Version="5.0.0" />
 		<PackageReference Include="Azure.Storage.Files.Shares" Version="12.8.0" />
-		<PackageReference Include="Microsoft.FeatureManagement" Version="3.1.1" />
+		<PackageReference Include="Microsoft.FeatureManagement" Version="4.0.0" />
 		<PackageReference Include="Microsoft.FeatureManagement.AspNetCore" Version="3.1.1" />
 		<PackageReference Include="Microsoft.IdentityModel.Protocols.OpenIdConnect" Version="6.35.0" />