Start building riscv64 platform wheels in CI/CD (v2 PR with upstream cibuildwheel support)

[eshattow]

Build for riscv64 architecture (v2 PR)

RISC-V 64-bit Little-endian architecture is officially supported by Ubuntu and Debian Linux distro stable releases. Alpine Linux has support for riscv64 as of release 3.21; RHEL-based distros also have support such as RockyLinux Official Support for RISC-V in RL10.

Add riscv64 architecture to the ci-cd wheel builds to expand software ecosystem support for RISC-V.

Previously reverted in 616db7a due to lack of cibuildwheel support upstream for riscv64 then, and since generally available as of cibuildwheel 3.12

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.75%. Comparing base (cf1460e) to head (31577a7).
⚠️ Report is 11 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #11425   +/-   ##
=======================================
  Coverage   98.75%   98.75%           
=======================================
  Files         129      129           
  Lines       43418    43418           
  Branches     2325     2325           
=======================================
  Hits        42879    42879           
  Misses        384      384           
  Partials      155      155           

Flag	Coverage Δ
CI-GHA	98.64% <ø> (ø)
OS-Linux	98.37% <ø> (+<0.01%)	⬆️
OS-Windows	96.81% <ø> (ø)
OS-macOS	97.68% <ø> (ø)
Py-3.10.11	97.33% <ø> (+<0.01%)	⬆️
Py-3.10.18	97.72% <ø> (+<0.01%)	⬆️
Py-3.11.13	97.91% <ø> (ø)
Py-3.11.9	97.52% <ø> (-0.01%)	⬇️
Py-3.12.10	97.62% <ø> (-0.02%)	⬇️
Py-3.12.11	98.01% <ø> (ø)
Py-3.13.5	?
Py-3.13.7	98.27% <ø> (?)
Py-3.9.13	97.21% <ø> (-0.01%)	⬇️
Py-3.9.23	97.61% <ø> (+<0.01%)	⬆️
Py-pypy7.3.16	92.14% <ø> (+4.18%)	⬆️
VM-macos	97.68% <ø> (ø)
VM-ubuntu	98.37% <ø> (+<0.01%)	⬆️
VM-windows	96.81% <ø> (ø)

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[codspeed-hq]

CodSpeed Performance Report

Merging #11425 will not alter performance

_{Comparing eshattow:patch-1 (31577a7) with master (f9996b5)}

Summary

✅ 59 untouched benchmarks

[webknjaz]

@eshattow FYI we're talking internally about the possibility to declare exotic architectures like this as tier 2/3 and fully relying on external contributions to keep them working. If this starts causing problems, we'll be dropping it from the matrix again unless someone else steps in to be fixing related issues.

[patchback]

Backport to 3.13: 💚 backport PR created

✅ Backport PR branch: patchback/backports/3.13/6d76b651b2c1e99be0de733aee733874be4a698a/pr-11425

Backported as #11446

🤖 @patchback
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