remove .net 6

Author: mattjohnsonpint

src/TimeZoneNames/TimeZoneNames.csproj

@@ -3,7 +3,7 @@
   <PropertyGroup>
     <Description>Provides localized time zone names.</Description>
     <Authors>Matt Johnson-Pint</Authors>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;net462;net6.0;;net8.0;net9.0;</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;netstandard2.1;net462;net8.0;net9.0;</TargetFrameworks>
     <PackageId>TimeZoneNames</PackageId>
     <PackageTags>timezone;time;zone;time zone;iana;tzdb;olson;timezoneinfo;globalization;international;localization</PackageTags>
     <PackageProjectUrl>https://github.com/mattjohnsonpint/TimeZoneNames</PackageProjectUrl>
@@ -25,7 +25,7 @@
   <ItemGroup>
     <EmbeddedResource Include="data.json.gz" />
   </ItemGroup>
-  
+
   <ItemGroup>
     <PackageReference Include="TimeZoneConverter" Version="7.0.0" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="All"/>