update ChangeLog

PeterHjortLauritzen · Jun 27, 2024 · 759804d · 759804d
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+Purpose of changes:
+
+	- HB diffusion in CAM7 performs mixing for stable conditions (Ri>0) as well as background mixing in addition to unstable mixing (Ri<0)
+	  Modify HB in CAM7 to only mix for unstable conditions
+	- add div4 sponge (in SE dycore) in MT configuration for stability
+
 
+	Closes issue https://github.com/ESCOMP/CAM/issues/1062
+	Expect answer changes for all CAM7 regression tests
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 Tag name: cam6_3_160