[MM-54984] Update code.sajari.com/docconv to latest v2 (#25975)

* Update code.sajari.com/docconv to latest v2

* go mod tidy

server/platform/services/docextractor/documents.go

@@ -9,7 +9,7 @@ import (
 	"path"
 	"strings"
 
-	"code.sajari.com/docconv"
+	"code.sajari.com/docconv/v2"
 )
 
 type documentExtractor struct{}