[RelNotes] Add RooFit contributors for v626 development cycle
[RelNotes] Add RooFit contributors for v626 development cycle

The list of contributors was extracted as follows. First the starting
commit of the v626 development cycle was determined:

```
git merge-base root-project/master root-project/v6-24-00-patches
```

Then, the list of unique authors was extracted with `git log`:

```
git log ce7772b5bd4b06d212907aaaaaf0ad73a8cc6d23.. roofit | grep Author: | sort | uniq
```

Finally, all authors that could not be associated with a civil name and
authors that only contributed a trivial commit a la "fix typo" got
removed from the list.

Note that Fernando Hueso-González is @ferdymercury.

olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root