Import Debian changes 2.58.3-2+deb10u1

glib2.0 (2.58.3-2+deb10u1) buster; urgency=medium

  * Team upload
  * d/p/keyfile-settings-Use-tighter-permissions.patch:
    Backport patch from upstream 2.60.0 so that the GKeyFile settings
    backend creates ~/.config and configuration files with restrictive
    permissions (Closes: #931234, CVE-2019-13012)
  * d/gbp.conf: Swap branch to debian/buster