Update support for .slnx files

Extends support to recognize and handle .slnx solution files in addition to .sln files.

This ensures consistent configuration and formatting for both types of solution files across the project.

Author: edumserrano

.gitattributes

@@ -13,4 +13,5 @@
 *.cs text=auto diff=csharp
 
 *.csproj text=auto
-*.sln text=auto eol=crlf
+*.sln text=auto eol=crlf
+*.slnx text=auto eol=crlf

MarkdownLinkCheckLogParser/.editorconfig

@@ -26,7 +26,7 @@ trim_trailing_whitespace = true
 ##########################################
 
 # Visual Studio Solution Files
-[*.sln]
+[*.{sln,.slnx}]
 indent_style = tab
 
 # Visual Studio XML Project Files