Update Haddock submodule to fix #23368

This submodule update adds the following three commits:

bbf1c8ae - Check for puns
0550694e - Remove fake exports for (~), List, and Tuple<n>
5877bceb - Fix pretty-printing of Solo and MkSolo

These commits fix the issues with Haddock HTML rendering reported in
ticket #23368.

Fixes #23368

(cherry picked from commit 5f585906)

haddock @ 9b684097

-Subproject commit 342b0b39bc4a9ac6ddfa616bf7e965263ce78b50
+Subproject commit 9b6840977177e34771c652caeb4243bce89e5b97