Suggestion: use native pipe, drop magrittr dependency

[florianm]

ckanr has very few dependencies, which is great for maintainability.

This is a suggestion to remove the dependency on magrittr by using the native pipe.
This would require:

• Update DESCRIPTION to Require R >=4.1.0
• Update any code using magrittr::%>% to use the native pipe |>
• Update DESCRIPTION to remove magrittr from Imports
• Run tests to verify we didn't break anything

References

• https://ivelasq.rbind.io/blog/understanding-the-r-pipe/
• https://www.tidyverse.org/blog/2023/04/base-vs-magrittr-pipe/
• https://stackoverflow.com/questions/67633022/what-are-the-differences-between-rs-native-pipe-and-the-magrittr-pipe