Deprecation warning from ggplot2: aes_string() used in FeatureEffect plots

Hello,

When using the iml package with recent versions of ggplot2, I get the following warning when plotting FeatureEffect objects (ALE, PDP):

Warning:
`aes_string()` was deprecated in ggplot2 3.0.0.
The deprecated feature was likely used in the iml package.

This occurs, for example, with:

FeatureEffect$new(predictor, feature = "lstat", method = "ale")
plot(...)

The plot is generated correctly, so this is not a critical issue, but the warning appears consistently and may be confusing for users (especially in teaching materials).

I understand this is due to ggplot2 changes, but I wanted to report it in case it is helpful for future updates.

Best regards,