bump changelog

CHANGELOG.md

@@ -23,6 +23,13 @@ change warranting a new major release:
   that scheduling is done in big blocks to reduce risk of missed deadlines.
 - Replaced chained locks for polling new sensor data to the `AcsController`
 
+## Fixed
+
+- Bugfix for PDEC handler which causes the PIR register of the PDEC to never
+  be cleared on release builds. The dummy variable used to read the register
+  needs to be declared volatile to avoid compiler optimizations.
+  PR: https://egit.irs.uni-stuttgart.de/eive/eive-obsw/pulls/374
+
 # [v1.26.1] 2023-02-08
 
 - Initialize parameter helper in ACS controller.