ci: host WiX 3.14.0.8606 binaries ourselves

Follow the approach from commit 9ff7fffbf4 (ci: host WiX 3.14.0.6526
binaries ourselves, 2022-08-02, v3.24.0~6^2) for the updated version.
Since we use WiX to package our official release binaries, avoid relying
on an externally-hosted package by hosting it at `cmake.org`.