Should we make GHC support windows narrower?

[ffaf1]

Should we make GHC support window narrower than it is?

See #11722 for sister issue (what unit to use for the support window).

PRs that got bit by our support window:

• Stop stealing the vowels #11510

[ulysses4ever]

I don't like to remove comments so here's a link to my (misplaced) comment to this issues: #11722 (comment)

[Bodigrim]

I second #11722 (comment), let's cut the support window to 3 years. Which would mean dropping GHC 9.0.2 (released Dec 2021), but keeping GHC 9.2.8 (released May 2023). Which conveniently unblocks #11510.