set next release version to 4.4.1 (#3513)

Author: aymanhab

CHANGELOG.md

@@ -6,7 +6,7 @@ request related to the change, then we may provide the commit.
 
 This is not a comprehensive list of changes but rather a hand-curated collection of the more notable ones. For a comprehensive history, see the [OpenSim Core GitHub repo](https://github.com/opensim-org/opensim-core).
 
-v4.5
+v4.4.1
 ======
 - IMU::calcGyroscopeSignal() now reports angular velocities in the IMU frame.
 - Update `report.py` to set specific colors for plotted trajectories

CMakeLists.txt

@@ -28,8 +28,8 @@ include(FeatureSummary)
 # OpenSim version.
 # ----------------
 set(OPENSIM_MAJOR_VERSION 4)
-set(OPENSIM_MINOR_VERSION 5)
-set(OPENSIM_PATCH_VERSION 0)
+set(OPENSIM_MINOR_VERSION 4)
+set(OPENSIM_PATCH_VERSION 1)
 
 # Don't include the patch version if it is 0.
 set(PATCH_VERSION_STRING)