chore(deps): bump Microsoft.FeatureManagement

Bumps [Microsoft.FeatureManagement](https://github.com/microsoft/FeatureManagement-Dotnet) from 3.5.0 to 4.0.0.
- [Release notes](https://github.com/microsoft/FeatureManagement-Dotnet/releases)
- [Commits](microsoft/FeatureManagement-Dotnet@3.5.0...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]>

src/Authentication/Altinn.Platform.Authentication.csproj

@@ -23,7 +23,7 @@
     <PackageReference Include="Microsoft.AspNetCore.Antiforgery" Version="2.2.0" />
     <PackageReference Include="Microsoft.Azure.Services.AppAuthentication" Version="1.6.2" />
     <PackageReference Include="Microsoft.Extensions.Configuration.AzureKeyVault" Version="3.1.24" />
-	<PackageReference Include="Microsoft.FeatureManagement" Version="3.5.0" />
+	<PackageReference Include="Microsoft.FeatureManagement" Version="4.0.0" />
 	<PackageReference Include="Microsoft.FeatureManagement.AspNetCore" Version="3.5.0" />
 	<PackageReference Include="Microsoft.IdentityModel.Protocols.OpenIdConnect" Version="8.2.0" />
     <PackageReference Include="JWTCookieAuthentication" Version="4.0.1" />