fix(deps): update module github.com/johanneskaufmann/html-to-markdown to v2

Author: renovate[bot]

go.mod

@@ -5,7 +5,7 @@ go 1.24.0
 toolchain go1.25.1
 
 require (
-	github.com/JohannesKaufmann/html-to-markdown v1.6.0
+	github.com/JohannesKaufmann/html-to-markdown/v2 v2.4.0
 	github.com/JohannesKaufmann/html-to-markdown/v2 v2.4.0
 	github.com/go-shiori/go-readability v0.0.0-20250217085726-9f5bf5ca7612
 	github.com/modelcontextprotocol/go-sdk v0.5.0