[3.13] gh-125933: Add ARIA labels to select elements in the version switcher (GH-125934) (#125938)

gh-125933: Add ARIA labels to select elements in the version switcher (GH-125934)
(cherry picked from commit 1306f33c84b2745aa8af5e3e8f680aa80b836c0e)

Co-authored-by: Kerim Kabirov <the.privat33r+gh@pm.me>
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>