Adding support for data-src Attribute (#1226)

* supportfordata-src

Author: Noah-Zhuhaotian

packages/markitdown/src/markitdown/converters/_markdownify.py

@@ -92,7 +92,7 @@ def convert_img(
         """Same as usual converter, but removes data URIs"""
 
         alt = el.attrs.get("alt", None) or ""
-        src = el.attrs.get("src", None) or ""
+        src = el.attrs.get("src", None) or el.attrs.get("data-src", None) or ""
         title = el.attrs.get("title", None) or ""
         title_part = ' "%s"' % title.replace('"', r"\"") if title else ""
         if (