Merge branch 'js/ci-github-update-ubuntu' into maint-2.49

Adjust to the deprecation of use of Ubuntu 20.04 GitHub Actions CI. * js/ci-github-update-ubuntu: ci: upgrade `sparse` to supported build agents

Junio C Hamano committed Apr 24, 2025 at 17:13 UTC 8829bbfba1dcb1de328319f9bc75a0b5322fe0b6

No changes.