changes.txt: updates after release of 1.26.7.

Author: julian-smith-artifex-com

changes.txt

@@ -2,10 +2,12 @@ Change Log
 ==========
 
 
-**Changes in version 1.26.7**
+**Changes in version 1.26.7** (2025-12-11)
 
 * Use MuPDF-1.26.12.
 
+  * **Fixed** `4801 <https://github.com/pymupdf/PyMuPDF/issues/4801>`_: Build failure dumping all environment variables
+
 Other:
 
   * Retrospectively mark `4756 <https://github.com/pymupdf/PyMuPDF/issues/4756>`_ as fixed in 1.26.6.