channels: Emit version 3 profiles.

Fixes <https://issues.guix.gnu.org/56441>.
Reported by zimoun <zimon.toutoune@gmail.com>.

Fixes a bug introduced in 4ff12d1de7cd617b791996ee7ca1240660b4c20e with
version 4 of the manifest format.  A new 'guix time-machine' would
create a v4 manifest; when targeting an old revision (v3),
'generate-package-cache' would fail to read that manifest and abort.
Furthermore, an old Guix living in a new profile with a v4 manifest
would be unable to describe itself via (guix describe).

* guix/channels.scm (package-cache-file): Add 'format-version' field to
PROFILE.
(channel-instances->derivation): Pass #:format-version to
'profile-derivation'.

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