Add Lorenzo to CODEOWNERS (#118)

#skip-changelog

## 📜 Description
<!--- Describe your changes in detail -->


## 💡 Motivation and Context
<!--- Why is this change required? What problem does it solve? -->
<!--- If it fixes an open issue, please link to the issue here. -->


## 💚 How did you test it?


## 📝 Checklist
<!--- Put an `x` in the boxes that apply -->
- [ ] I reviewed the submitted code
- [ ] I added tests to verify the changes
- [ ] I updated the docs if needed
- [ ] No breaking changes


## 🔮 Next steps

.github/CODEOWNERS

@@ -1 +1 @@
-*       @markushi @romtsn @adinauer
+*       @markushi @romtsn @adinauer @lcian