Merge topic 'update-curl'

d781e3b477 Tests: Update https-is-disabled error message for curl 8.21
b5b8651a68 curl: Set build options the way we need for CMake
0ac4d03eca Merge branch 'upstream-curl' into update-curl
ecbccb29a7 curl 2026-06-24 (68720b48)
25d2d31002 curl: Update script to get curl 8.21.0

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !12230