[SB] Fix assembly warnings caused by version mismatch (#382)

Author: shishirx34

src/NuGet.Services.KeyVault/NuGet.Services.KeyVault.csproj

@@ -10,7 +10,7 @@
       <Version>3.0.5</Version>
     </PackageReference>
     <PackageReference Include="Microsoft.Azure.Services.AppAuthentication">
-      <Version>1.3.1</Version>
+      <Version>1.4.0</Version>
     </PackageReference>
     <PackageReference Include="Microsoft.Extensions.Logging.Abstractions">
       <Version>2.2.0</Version>

src/NuGet.Services.ServiceBus/NuGet.Services.ServiceBus.csproj

@@ -6,6 +6,10 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <!--Microsoft.Azure.Services.AppAuthentication is a transitive dependency from the WindowsAzure.ServiceBus and it has a bug: 
+      it references 1.0.3 package dependency but 1.4.0 as the referenced assembly. This causes all the upstream projects give a 
+      warning for assembly conflicts. Add this reference to fix these warnings-->
+    <PackageReference Include="Microsoft.Azure.Services.AppAuthentication" Version="1.4.0" />
     <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions">
       <Version>2.2.0</Version>
     </PackageReference>