setup.py changes.txt: upgrade to mupdf-1.26.12 by default.

Author: julian-smith-artifex-com

changes.txt

@@ -4,6 +4,8 @@ Change Log
 
 **Changes in version 1.26.7**
 
+* Use MuPDF-1.26.12.
+
 Other:
 
   * Retrospectively mark `4756 <https://github.com/pymupdf/PyMuPDF/issues/4756>`_ as fixed in 1.26.6.

setup.py

@@ -1278,7 +1278,7 @@ def sdist():
 # PyMuPDF version.
 version_p = '1.26.7'
 
-version_mupdf = '1.26.11'
+version_mupdf = '1.26.12'
 
 # 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