Fix "Uncategorized" heading left in changelog (#4740)

## Explanation

Introduced here:
https://github.com/MetaMask/core/pull/4544/files/6c61641d2987ccae098cff78b4d592e3e57fe1e2#r1686765290

## References

- See MetaMask/auto-changelog#207

## Changelog

No user-facing changes

## Checklist

- [ ] I've updated the test suite for new or updated code as appropriate
- [ ] I've updated documentation (JSDoc, Markdown, etc.) for new or
updated code as appropriate
- [ ] I've highlighted breaking changes using the "BREAKING" category
above as appropriate
- [ ] I've prepared draft pull requests for clients and consumer
packages to resolve any breaking changes

packages/json-rpc-middleware-stream/CHANGELOG.md

@@ -31,7 +31,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [8.0.2]
 
-### Uncategorized
+### Changed
 
 - Bump TypeScript version to `~5.0.4` and set `moduleResolution` option to `Node16` ([#3645](https://github.com/MetaMask/core/pull/3645))
 - Bump `@metamask/utils` from `^9.0.0` to `^9.1.0` ([#4529](https://github.com/MetaMask/core/pull/4529))