maintainers-list: add a GDPR note, avoid unnecessary data collection

This change was preceded by the idea of adding a pronoun field to the
file, which we determined to be a bad idea:

* maintainers-list: add pronoun to the optional fields

I often do not know how to address maintainers, so giving them the
ability to specify their pronouns is helpful for communication
purposes.

* maintainers-list: add pronoun for Profpatsch

maintainers-list: make the pronoun field into a list

Some people have a set of pronouns they are fine with, so let’s make
that possible.

Based on feedback by somebody With An Idea™ of the topic.

* maintainers-list: remove the pronouns field

The discussion around the field raised a good point, quoting:

> What you are proposing here is keeping an irrevocable permanent
> history of people’s pronouns. It makes anybody would want to do bad
> things with it one small script away from a list of which Nixpkgs
> contributors are trans. Even looking at the history of name
> changes (which we probably also shouldn’t store) wouldn’t be nearly
> as reliable a source. While it might be tempting to say that
> participating in this would be optional, it would be establishing a
> de facto standard location for this information, that might make
> people feel compelled to participate or accept having the wrong
> pronoun used. Compounding this is the fact that the people who will
> be most comfortable using this field are the people who have never
> changed their pronouns. If they decide to in future, they now have
> to choose between permanently marking themselves as somebody who
> changed or deleted their pronouns (which is dangerous) or leaving
> the wrong pronouns up. Because of this, I think that over time this
> list would probably result in even more people being referred to by
> the wrong pronouns, because of outdated entries that are dangerous
> to correct.
>
> **This idea is extremely dangerous**. If somebody wants to publish
> their pronouns, they can already do that on their website or GitHub
> profile, without having to include that information in a large
> public dataset with history tracking.

So let’s remove it again.

maintainers/maintainer-list.nix

@@ -35,7 +35,7 @@
 
     !!! Note that PGP/GPG values stored here are for informational purposes only, don't use this file as a source of truth.
 
-    More fields may be added in the future.
+    More fields may be added in the future, however, in order to comply with GDPR this file should stay as minimal as possible.
 
     Please keep the list alphabetically sorted.
     See `./scripts/check-maintainer-github-handles.sh` for an example on how to work with this data.