[C++][CI] Failed builds due to missing simdjson

[pitrou]

Describe the bug, including details regarding any error messages, version, and platform.

See the Debian and Fedora C++/Python builds here:
https://lists.apache.org/thread/1qxogr0p77l06o9oh9250ncmz1wd47rd

Component(s)

C++, Continuous Integration