F-string formatting adds unnecessary space after `**` operator

Consider the following source code:

```py
f"aaaaaaaaaaaaaaaaaaaaaaaaaa {10**27} bbbbbbbbbbbbbbbbbbbbbbbbbb ccccccccccccccccccccccccc"
```

Running `ruff format --preview`:

```py
f"aaaaaaaaaaaaaaaaaaaaaaaaaa {10** 27} bbbbbbbbbbbbbbbbbbbbbbbbbb ccccccccccccccccccccccccc"
```

Playground: https://play.ruff.rs/80926d6e-f183-4631-94ce-f1702502a0e0

Found in https://github.com/astral-sh/ruff/pull/14454#issuecomment-2488346686

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F-string formatting adds unnecessary space after `**` operator #14487

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F-string formatting adds unnecessary space after ** operator #14487

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F-string formatting adds unnecessary space after `**` operator #14487