[Update] HtmlDocs docker file to net9

Author: samatstariongroup

Diff for: HtmlDocs/Dockerfile

@@ -4,6 +4,6 @@ WORKDIR /usr/share/nginx/html
 
 COPY HtmlDocs/nginx.conf /etc/nginx/nginx.conf
 
-COPY ../SysML2.NET.CodeGenerator.Tests/bin/Debug/net8.0/_SysML2.NET.Core.AutoGenHtmlDocs/index.html  .
-COPY ../SysML2.NET.CodeGenerator.Tests/bin/Debug/net8.0/_SysML2.NET.Core.AutoGenHtmlDocs/sysml2-class-inheritance.svg  .
+COPY ../SysML2.NET.CodeGenerator.Tests/bin/Debug/net9.0/_SysML2.NET.Core.AutoGenHtmlDocs/index.html  .
+COPY ../SysML2.NET.CodeGenerator.Tests/bin/Debug/net9.0/_SysML2.NET.Core.AutoGenHtmlDocs/sysml2-class-inheritance.svg  .
 COPY ../SysML2.NET.CodeGenerator/Resources/HtmlDocs .