chore(deps): update Prometheus.Client

Author: phnx47

src/Prometheus.Client.AspNetCore/Prometheus.Client.AspNetCore.csproj

@@ -33,7 +33,7 @@
     </None>
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Prometheus.Client" Version="4.1.0" />
+    <PackageReference Include="Prometheus.Client" Version="4.2.0" />
   </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'netcoreapp3.1'">
     <FrameworkReference Include="Microsoft.AspNetCore.App" />