changelog & deps updates for v0.31.0

Signed-off-by: Nicolas Höning <nicolas@seita.nl>

Author: nhoening

documentation/api/change_log.rst

@@ -5,7 +5,7 @@ API change log
 
 .. note:: The FlexMeasures API follows its own versioning scheme. This is also reflected in the URL (e.g. `/api/v3_0`), allowing developers to upgrade at their own pace.
 
-v3.0-29 | 2025-12-30
+v3.0-29 | 2026-02-28
 """"""""""""""""""""
 
 Added two new forecasting API endpoints:

documentation/changelog.rst

@@ -4,9 +4,11 @@ FlexMeasures Changelog
 **********************
 
 
-v0.31.0 | February XX, 2026
+v0.31.0 | February 28, 2026
 ============================
 
+.. note:: Read more on these features on `the FlexMeasures blog <https://flexmeasures.io/v031-forecasting-api-annotations/>`_.
+
 .. warning:: As of this version, power schedules will no longer appear flipped (in UI charts) when they are recorded on *consumption* sensors.
              Please note that:
 

documentation/cli/change_log.rst

@@ -4,7 +4,7 @@
 FlexMeasures CLI Changelog
 **********************
 
-since v0.31.0 | February XX, 2026
+since v0.31.0 | February 28, 2026
 =================================
 
 * Fix ``delete-beliefs`` CLI command ignoring the ``--source`` filter during deletion, preventing unintended removal of beliefs from other sources.