info-overview: Don't show GNOME micro version

Kalev Lember requested to merge wip/kalev/no-micro-version into master

With the new versioning scheme, GNOME just has major.minor versions (e.g. 40.rc, 40.0) and micro versions are no longer used. Even if gnome-desktop happens to get a micro version to fix a bug, it's not something we should show in the UI.

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