Update dependency NServiceBus.CustomChecks to v5

Author: dependencyupdates[bot]

src/SmokeTest.Server/SmokeTest.Server.csproj

@@ -14,7 +14,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="NServiceBus.CustomChecks" Version="3.0.1" />
+    <PackageReference Include="NServiceBus.CustomChecks" Version="5.0.1" />
     <PackageReference Include="NServiceBus.Heartbeat" Version="3.0.1" />
   </ItemGroup>