[GHC-Releases] Updating Linux distribution support

[Ben Gamari]

Hi all,

For the last several releases GHC has distributed binary distributions
for a largely-static set of Linux distributions, many quite old:

| Distribution        | End-of-life  | Supported    |
| ------------------- | ------------ | ------------ |
| Fedora 33           | Nov 2021     | no           |
| Fedora 38           | May 2024     | no           |
| Alpine 3.12         | May 2022     | no           |
| Alpine 3.18         | Apr 2025     |              |
| Alpine 3.20         | Apr 2026     |              |
| Debian 9            | Jul 2022     | no           |
| Debian 10           | Jun 2024     | no           |
| Debian 11           | Aug 2026     |              |
| Rocky 8             | May 2029     |              |
| Ubuntu 18.04        | May 2023     | no           |
| Ubuntu 20.04        | May 2025     | no           |
| Ubuntu 22.04        | Apr 2027     |              |

In #25876 I preliminarily propose that we whittle this down to the
following, more up-to-date set for 9.14.1:

| Distribution        | End-of-life  |
| ------------------- | ------------ |
| Fedora 41           | Nov 2025     |
| Alpine 3.20         | Apr 2026     |
| Debian 11           | Aug 2026     |
| Debian 12           | Jun 2028     |
| Rocky 8             | May 2029     |
| Ubuntu 24.04        | Apr 2029     |

If you have thoughts about this do let us know either via this list or
on the ticket.

Cheers,

- Ben
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