Update SafariConverterLib to v4: improved regexes, improved advanced rules

There's a new major update in SafariConverterLib, version v4.0.0:
https://github.com/AdguardTeam/SafariConverterLib/blob/v4.0.0/CHANGELOG.md

### Important changes

1. `url-filter` conversion has been changed, it should greatly improve the time required for Safari to load content blocking rules.
2. Web Extension now uses `browser.scripting.executeScript` API to apply JS and scriptlet rules. It solves quite a few filtering issues.
3. There's a bunch of other improvements, see the [full changelog](https://github.com/AdguardTeam/SafariConverterLib/blob/v4.0.0/CHANGELOG.md).