Bump Microsoft.AspNetCore.App in /amadeus-integration-test

Bumps [Microsoft.AspNetCore.App](https://github.com/aspnet/Universe) from 2.1.0 to 2.1.4.
- [Release notes](https://github.com/aspnet/Universe/releases)
- [Changelog](https://github.com/aspnet/Universe/blob/master/docs/CrossRepoBreakingChanges.md)
- [Commits](aspnet/Universe@2.1.0...2.1.4)

---
updated-dependencies:
- dependency-name: Microsoft.AspNetCore.App
  dependency-type: direct:production
...

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

Author: dependabot[bot]

amadeus-integration-test/amadeus-integration-test.csproj

@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.AspNetCore.App" Version="2.1.0" />
+    <PackageReference Include="Microsoft.AspNetCore.App" Version="2.1.4" />
     <PackageReference Include="Microsoft.AspNetCore.TestHost" Version="2.1.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.11.0" />
     <PackageReference Include="xunit" Version="2.4.1" />