chore(deps): update dependency prometheus.client.httprequestdurations to v4

Author: renovate[bot]

src/WebMetricPusher_3.1/WebMetricPusher_3.1.csproj

@@ -4,7 +4,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Prometheus.Client" Version="5.2.0" />
-    <PackageReference Include="Prometheus.Client.HttpRequestDurations" Version="3.6.0" />
+    <PackageReference Include="Prometheus.Client.HttpRequestDurations" Version="4.0.0" />
     <PackageReference Include="Prometheus.Client.MetricPusher" Version="3.1.0" />
     <PackageReference Include="Prometheus.Client.DependencyInjection" Version="1.4.0" />
   </ItemGroup>