Update Serval client version (#889)

Author: Enkidu93

samples/ApiExample/ApiExample.csproj

@@ -20,7 +20,7 @@
   <ItemGroup>
     <PackageReference Include="Duende.AccessTokenManagement" Version="4.1.1" />
     <PackageReference Include="Microsoft.Extensions.Configuration.UserSecrets" Version="10.0.3" />
-    <PackageReference Include="Serval.Client" Version="1.13.0" />
+    <PackageReference Include="Serval.Client" Version="1.15.0" />
   </ItemGroup>
 
 </Project>

src/Serval/src/Serval.Client/Serval.Client.csproj

@@ -2,7 +2,7 @@
 
 	<PropertyGroup>
 		<TargetFramework>netstandard2.1</TargetFramework>
-		<Version>1.13.0</Version>
+		<Version>1.15.0</Version>
 		<Description>Client classes for Serval.</Description>
 		<RootNamespace>Serval.Client</RootNamespace>
 		<Product>Serval</Product>