SPF records updated to reduce mail loss probabilities

[Sandro Santilli]

I've added the IP address of the new mail server in the SPF records to
reduce the probability of outgoing mail from new server being
considered spam while the DNS caches get updated.

The change was pushed to ansible with this commit:
https://gitea.osgeo.org/sac/ansible-deployment/commit/d42c44008fa4605d29b54587140e077909f09ece

And it was deployed by Laurențiu

It should now be possible for the new server to deliver mail with
sender address in the following domains:

  @osgeo.org
  @lists.osgeo.org
  @mail.osgeo.org (probably not needed)
  @discourse.osgeo.org (not really needed)

--strk;
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