Fix Read the Docs build: use ubuntu-24.04 image#365
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Problem
Read the Docs builds have been failing on
masterand on every open PR since ~2026-06-22, before any docs are built:Read the Docs retired the
ubuntu-20.04build image, but.readthedocs.ymlstill pinsbuild.os: ubuntu-20.04, so the build fails at config validation (~1s). The last successful RTD build was on 2026-06-03 (commit 19d4574), before the image was removed.Fix
Bump
build.osto a currently supported image (ubuntu-24.04). Nothing else changes — thepython: "3.13"toolchain and the build commands are identical to the last green build.Verified: reproduced the RTD build locally with this change and sphinx builds all pages successfully.
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