chore(deps): update conventional commit (#1693)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Chores**
* Updated changelog tooling dependencies and CI to fetch full Git
history; added conventional-changelog-conventionalcommits.
* **Tests**
* Added comprehensive tests for changelog output, header/tag handling,
fallback behavior, and compatibility with the updated changelog API.
* **Refactor**
* Reworked changelog generation to use the newer changelog API, improve
tag-aware headers, and support deriving PR-style changelogs with
graceful fallbacks.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

.github/workflows/main.yml

@@ -20,6 +20,8 @@ jobs:
     steps:
       - name: Checkout repo
         uses: actions/checkout@v5
+        with:
+          fetch-depth: 0
 
       - name: Install Node
         uses: actions/setup-node@v4