remove net6.0 tfm

Author: phnx47

src/Prometheus.Client.MetricPusher.HostedService.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>net462;netstandard2.0;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>net462;netstandard2.0;net8.0</TargetFrameworks>
     <Description>MetricPusher as HostedService for Prometheus.Client</Description>
     <RepositoryUrl>https://github.com/prom-client-net/prom-client-metricpusher-hostedservice</RepositoryUrl>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
@@ -12,10 +12,6 @@
     <PackageReference Include="Microsoft.Extensions.Hosting.Abstractions" Version="3.1.32 " />
     <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="3.1.32" />
   </ItemGroup>
-  <ItemGroup Condition="'$(TargetFramework)' == 'net6.0'">
-    <PackageReference Include="Microsoft.Extensions.Hosting.Abstractions" Version="6.0.1" />
-    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="6.0.0" />
-  </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'net8.0'">
     <PackageReference Include="Microsoft.Extensions.Hosting.Abstractions" Version="8.0.1" />
     <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="8.0.2" />

tests/Prometheus.Client.MetricPusher.HostedService.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks Condition="'$(OS)' == 'Unix'">net6.0;net8.0</TargetFrameworks>
-    <TargetFrameworks Condition="'$(OS)' != 'Unix'">net462;net6.0;net8.0</TargetFrameworks>
+    <TargetFramework Condition="'$(OS)' == 'Unix'">net8.0</TargetFramework>
+    <TargetFrameworks Condition="'$(OS)' != 'Unix'">net462;net8.0</TargetFrameworks>
     <IsPackable>false</IsPackable>
   </PropertyGroup>
   <ItemGroup>