wheels: drop --retry-all-errors, too new for AlmaLinux 8's curl

[revarbat]

Problem

The mirror fix in #130 broke the Linux wheels a different way:

curl: option --retry-all-errors: is unknown

--retry-all-errors landed in curl 7.71.0. manylinux_2_28 is AlmaLinux 8, whose curl is 7.61.

I claimed to have "verified the command end to end" — but I ran it on macOS, whose curl is current. That proved nothing about the curl that actually executes it inside the container.

Fix

Replaced with --retry-connrefused (7.52.0), which covers the failure mode that mattered. Every flag now used is 7.52 or older:

flag	Added
--retry	7.12.3
--retry-connrefused	7.52.0
--connect-timeout	7.7

Checked against Added: in curl/docs/cmdline-opts/<opt>.md, not from memory.

Recorded as a CURL FLAG CEILING comment beside the command so this does not recur.

Verified

• Parsed YAML value contains 0 newlines (the folded-scalar trap from wheels: fetch bison from a mirror, not only ftp.gnu.org #130 still holds)
• No banned flag in the command — the only two --retry-all-errors strings left are in the warning comment
• Flag set asserted programmatically: ['--connect-timeout', '--prefix', '--retry', '--retry-connrefused']

Note this still cannot be proven before merge: wheels.yml only runs on tags, and there is no container runtime here to test the real image against.

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