chore(main): release nixpkgs-track_lib 0.3.0

:robot: I have created a release *beep* *boop* --- ## [0.3.0](https://github.com/uncenter/nixpkgs-track/compare/nixpkgs-track_lib-v0.2.0...nixpkgs-track_lib-v0.3.0) (2026-01-09) ### Features * support tracking stable branches ([#14](https://github.com/uncenter/nixpkgs-track/issues/14)) ([44937e8](https://github.com/uncenter/nixpkgs-track/commit/44937e8126698f70549510e8ee311e6a5fcb4f8c)) --- This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).