update CHANGELOG in preparation for new release

Author: felipesanches

CHANGELOG.md

@@ -1,10 +1,6 @@
 Below are the noteworthy changes from each release.
 A more detailed list of changes is available in the corresponding milestones for each release in the Github issue tracker (https://github.com/googlefonts/fontbakery/milestones?state=closed).
 
-## Upcoming release: 1.1.1 (2025-??-??)
-  - ...
-
-
 ## 1.1.0 (2025-Oct-02)
   - Replace deprecated `pkg_resources` by `importlib.resources` (issue #5028)