Prepare release v30.0.1

- drawio submodule: unchanged (no drawio_ref supplied; CI builds from drawio-dev) (3e8cb37582cd9d60478aad5c3a53619bd0f5cc56)
- Updated package.json version to 30.0.1
- Updated package-lock.json
- Electron version: 42.0.1

Automated by prepare-release workflow