add net6 and net9

Author: jogibear9988

src/S7CommPlusDriver/S7CommPlusConnectionHighLevel.cs

@@ -422,7 +422,7 @@ public int GetBlockXml(uint relid, out string blockName, out ProgrammingLanguage
                                 var blob_sp3 = xx.GetValue();
                                 blockBody = new string[blob_sp3.Where(x => x.Key < (uint)BinaryArtifacts.PlcFamily).Count()];
                                 var i = 0;
-                                foreach (var key in blob_sp3.Keys.Order())
+                                foreach (var key in blob_sp3.Keys.OrderBy(x => x))
                                 {
                                     if (!(key < (uint)BinaryArtifacts.PlcFamily))
                                     {

src/S7CommPlusDriver/S7CommPlusDriver.csproj

@@ -1,9 +1,9 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>net8.0</TargetFrameworks>
+    <TargetFrameworks>net6.0;net8.0;net9.0</TargetFrameworks>
     <OutputType>Library</OutputType>
     <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
-    <LangVersion>9.0</LangVersion>
+    <LangVersion>10.0</LangVersion>
   </PropertyGroup>
   <PropertyGroup>
     <StartupObject />