Update CHANGELOG.md

CHANGELOG.md

@@ -60,6 +60,7 @@ BUG FIXES:
 * core: Fix race in GetVariableValue [GH-24599]
 * core: Instances are now destroyed only using their stored state, removing many cycle errors [GH-24083]
 * core: Destroy provisioners should not evaluate for_each expressions [GH-24163]
+* funcs/jsonencode: Fix null value handling [GH-25078]
 * lang: Fix non-string key panics in map function [GH-24277]
 * lang: `substr("abc", 0, 0)` would previously return `"abc"`, despite the length argument being `0`. This has been changed to return an empty string when length is zero. [GH-24318]
 * lang: `ceil(1/0)` and `floor(1/0)` would previously return a large integer value, rather than infinity. This has been fixed. [GH-21463]