update prometheus.client to 6.1.0 (#180)

Author: renovate[bot]

src/Prometheus.Client.DependencyInjection.csproj

@@ -6,7 +6,7 @@
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Prometheus.Client" Version="6.0.0" />
+    <PackageReference Include="Prometheus.Client" Version="6.1.0" />
     <PackageReference Condition="'$(TargetFramework)' == 'net462' OR '$(TargetFramework)' == 'netstandard2.0'"
                       Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="3.1.32" />
     <PackageReference Condition="'$(TargetFramework)' == 'net6.0'"