[clang-format] breaks C++ code (adds space around "->")

since clang 18

```c++
A::A()
    : B()
{
    Q_EMIT bar::instance()->exec();
}
```
formatted to:
```c++
A::A()
    : B()
{
    Q_EMIT bar::instance() -> exec();
}
```

This happens with any default style or even
```
---
IndentWidth: 4
---
```

original issue: https://invent.kde.org/frameworks/extra-cmake-modules/-/issues/15