/mu, other glyphs not italic in all Italic masters

<img width="991" alt="image" src="https://github.com/github/hubot-sans/assets/51919489/aef6d56b-c79c-4a15-8be0-5b5ca4b90c72">

```[tasklist]
### Tasks
- [x] mu
- [x] pi
- [ ] ordfeminine
- [ ] ordmasculine
- [ ] paragraph
- [ ] at
- [ ] macroncomb
- [ ] Thorn
- [ ] trademark
- [ ] ae
- [ ] currency
```
