Release v3.6.2

The previous release (v3.6.1) was tagged at the wrong commit. This
release includes the changes described in that release note.

This release fixes a bug where swupd-server was creating the staged and
delta directories within the packs with 0750 permissions instead of the
expected 0700 permissions. It also adds a configuration option to
server.ini to ban debuginfo from the manifests and configure where
debuginfo libs and src are stored. Also prunes mistakenly added
debuginfo from the manifests when added accidentally and configured to
do so via server.ini.