docs(src/assets/): update pip official documentation

Signed-off-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: KemingHe

src/assets/pip/_metadata.json

@@ -1,6 +1,6 @@
 {
   "source_repo": "pypa/pip",
   "docs_path": "docs",
-  "updated_at": "2025-07-21T03:26:02Z",
+  "updated_at": "2025-07-21T15:39:06Z",
   "commit_sha": "7f76f2b9b56bd57761aab65d681087c918879212"
 }