Update CHANGELOG.md

Author: jpnurmi

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+**Breaking**:
+
+- `sentry_value_incref` now returns `sentry_value_t` and `sentry_value_decref` returns `int` (0 if freed). ([#1763](https://github.com/getsentry/sentry-native/pull/1763))
+
 **Features**:
 
 - Add a `transfer_timeout` option for SDK-managed HTTP transports. ([#1741](https://github.com/getsentry/sentry-native/pull/1741))
@@ -21,6 +25,7 @@
 - Cap rate-limit retry-after values at 24 hours to prevent a MITM-provided response from disabling event delivery for the process lifetime. ([#1744](https://github.com/getsentry/sentry-native/pull/1744))
 - Native: validate ELF header entry sizes. ([#1746](https://github.com/getsentry/sentry-native/pull/1746))
 - Structured logs: respect printf argument widths when extracting log parameters to avoid stack-data disclosure and corrupted attributes on 32-bit platforms. ([#1752](https://github.com/getsentry/sentry-native/pull/1752))
+- Fix TOCTOU races in transaction/span refcounting by switching to the atomic decref return value. ([#1763](https://github.com/getsentry/sentry-native/pull/1763))
 
 ## 0.14.2