closes https://github.com/TryGhost/Team/issues/564
refs https://github.com/TryGhost/Ghost/issues/10236
- The notification to upgrade to new 4.0 Ghost version was still visible to users after upgrading the instance to 4.0. This was caused by notification filtering not taking into account 3.x or 4.x versions.
- The fix filters out notifications that detect a major version notification using `x.0 is now available` pattern and compares current version to that major. This should future proof the issue from happening in Ghost 5.0 (but a proper holistic fix is preferable!)