and added safety alerts channel id to GuildUpdateBuilder
## Type of change
- [x] Bug fix (non-breaking change which fixes an issue)
- [x] New feature (non-breaking change which adds functionality)
# Checklist:
- [ ] Ran `dart analyze` or `make analyze` and fixed all issues
- [ ] Ran `dart format --set-exit-if-changed -l 160 ./lib` or `make format` and fixed all issues
- [x] I have performed a self-review of my own code
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have made corresponding changes to the documentation
- [ ] I have added tests that prove my fix is effective or that my feature works
Description