docs(changelog): add missing entry for #2136 (backport #2459) (#2464)

This is an automatic backport of pull request #2459 done by
[Mergify](https://mergify.com).


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Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>

.changelog/unreleased/bug-fixes/2136-fix-state-rollback.md

@@ -0,0 +1,2 @@
+- `[state]` Fix rollback to a specific height
+  ([\#2136](https://github.com/cometbft/cometbft/pull/2136))