Fix Ubuntu Lunar Lobster dates

Thomas Bechtoldrequested to merge
toabctl/distro-info-data:lunar-correct-date into main

The release will be on 2023-04-20 [0], the EOL date will be exactly 9 month later (2024-01-19).

[0] https://discourse.ubuntu.com/t/lunar-lobster-release-schedule/27284

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