fix constant width for checkmark (#8702)
### Description
The unicode codepoint (✔) we used for a checkmark is not monospace on
some platforms (i.e. linux).
<img width="25%"
src="https://github.com/vercel/turbo/assets/15232461/03cba20a-1f4a-4818-846a-4cef56b8c6eb"
/>
This PR updates that to use the [characters matching
Next.JS](https://github.com/vercel/next.js/blob/1a04d94aaec943d3cce93487fea3b8c8f8898f31/packages/next/src/build/output/log.ts)
(and many other CLI tools before it). Prior to this PR, this resulted in
the checkmark overflowing its boundary into the border.
| BEFORE | AFTER |
| - | - |
|
|
|
### Testing Instructions
```sh
cargo tr-build
./target/debug/turbo test --filter "./packages/*" --continue --force
```
