Update CHANGELOG.md

CHANGELOG.md

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 # Changelog
 
+## [0.9.104](https://github.com/aklivity/zilla/tree/0.9.104) (2024-12-02)
+
+[Full Changelog](https://github.com/aklivity/zilla/compare/0.9.103...0.9.104)
+
+**Fixed bugs:**
+
+- `affinity mask must specify at least one bit` crash preventing Zilla from starting on Windows 11 + Docker Compose [\#1338](https://github.com/aklivity/zilla/issues/1338)
+
+**Merged pull requests:**
+
+- Json serialization of nullable fields [\#1341](https://github.com/aklivity/zilla/pull/1341) ([akrambek](https://github.com/akrambek))
+
 ## [0.9.103](https://github.com/aklivity/zilla/tree/0.9.103) (2024-11-27)
 
 [Full Changelog](https://github.com/aklivity/zilla/compare/0.9.102...0.9.103)