Dhruv Manilawala 17fba99ed4 Report precise location for invalid conversion flag (#7809) ...

## Summary

This PR updates the parser definition to use the precise location when reporting
an invalid f-string conversion flag error.

Taking the following example code:
```python
f"{foo!x}"
```

On earlier version,
```
Error: f-string: invalid conversion character at byte offset 6
```

Now,
```
Error: f-string: invalid conversion character at byte offset 7
```

This becomes more useful when there's whitespace between `!` and the flag value
although that is not valid but we can't detect that now.

## Test Plan

As mentioned above.

2023-10-05 17:46:14 +05:30

..

src

Report precise location for invalid conversion flag (#7809)

2023-10-05 17:46:14 +05:30

build.rs

Pull in RustPython parser (#6099)

2023-07-27 09:29:11 +00:00

Cargo.toml

Use crates.io unicode_names2 0.6.0 (#6478)

2023-10-02 18:17:38 -04:00