docs: update CHANGELOG.md for main [skip ci]

Author: QuadStingray

CHANGELOG.md

@@ -1,3 +1,8 @@
+## [v3.0.8] - 2025-09-04
+### :recycle: Refactors
+- [`ff4b750`](https://github.com/MongoCamp/mongodb-driver/commit/ff4b75048a65cf43b41ab31b9283d6cfda5b5c04) - improve `JsonConverter` and `CirceSchema` methods *(commit by [@QuadStingray](https://github.com/QuadStingray))*
+
+
 ## [v3.0.3] - 2025-03-31
 ### :recycle: Refactors
 - [`28dc13e`](https://github.com/MongoCamp/mongodb-driver/commit/28dc13e220e344aa258f31ac131bc323916404e9) - package object json extends AutoDerivation to not need double import *(commit by [@QuadStingray](https://github.com/QuadStingray))*
@@ -317,3 +322,4 @@
 [v3.0.1]: https://github.com/MongoCamp/mongodb-driver/compare/v3.0.0...v3.0.1
 [v3.0.2]: https://github.com/MongoCamp/mongodb-driver/compare/v3.0.1...v3.0.2
 [v3.0.3]: https://github.com/MongoCamp/mongodb-driver/compare/v3.0.2...v3.0.3
+[v3.0.8]: https://github.com/MongoCamp/mongodb-driver/compare/v3.0.7...v3.0.8