Increment version to 5.6.1 (used for pre-release builds from ci)

Author: bkoelman

Diff for: Directory.Build.props

@@ -27,6 +27,6 @@
     <WarnOnPackingNonPackableProject>false</WarnOnPackingNonPackableProject>
     <CodeAnalysisRuleSet>$(MSBuildThisFileDirectory)CodingGuidelines.ruleset</CodeAnalysisRuleSet>
     <RunSettingsFilePath>$(MSBuildThisFileDirectory)tests.runsettings</RunSettingsFilePath>
-    <JsonApiDotNetCoreMongoDbVersionPrefix>5.6.0</JsonApiDotNetCoreMongoDbVersionPrefix>
+    <JsonApiDotNetCoreMongoDbVersionPrefix>5.6.1</JsonApiDotNetCoreMongoDbVersionPrefix>
   </PropertyGroup>
 </Project>