Ollama v0.30.4 updates llama.cpp version and fixes Windows cleanup.

Core summary

One sentence to understand this update

Ollama v0.30.4 includes a `llama.cpp` version update and fixes for killing the `llama-server` during Windows cleanup, noting a known `gemma4:12b` crash.

Impact & opportunity

What this could mean

Users benefit from an updated `llama.cpp` backend and improved stability on Windows, but should be aware of the `gemma4:12b` crash issue.