community: Strip URLs from sitemap. (#30830)

Fixes #30829

- **Description:** Simply strips the loc value when building the
element.
    - **Issue:** Fixes #30829

libs/community/langchain_community/document_loaders/sitemap.py

@@ -185,7 +185,7 @@ class SitemapLoader(WebBaseLoader):
 
             els.append(
                 {
-                    tag: prop.text
+                    tag: prop.text.strip()
                     for tag in ["loc", "lastmod", "changefreq", "priority"]
                     if (prop := url.find(tag))
                 }