setup.py: use mupdf-1.26.11.

Author: julian-smith-artifex-com

setup.py

@@ -1270,7 +1270,7 @@ def sdist():
 # PyMuPDF version.
 version_p = '1.26.6'
 
-version_mupdf = '1.26.10'
+version_mupdf = '1.26.11'
 
 # PyMuPDFb version. This is the PyMuPDF version whose PyMuPDFb wheels we will
 # (re)use if generating separate PyMuPDFb wheels. Though as of PyMuPDF-1.24.11