Merge branch 'js/github-actions-update'

Update remaining GitHub Actions jobs to avoid warnings against using deprecated version of Node.js. * js/github-actions-update: ci(linux32): add a note about Actions that must not be updated ci: bump remaining outdated Actions versions With this backport, `maint-2.39`'s CI builds are finally healthy again. Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>