Beta v8.4.9 released

[jcoffland]

Changes:

fah-web-client

• Show Warning when more than one consecutive WU fails.

fah-client

• Recommend nvidia-opencl-icd package on Debian install. Linux: Supported GPU not recognised wo/ GPU driver packages installed. #293
• Attempt graceful shutdown of client in Windows installer. Windows 10 and 11 version "forgets" CPU WU after system restart #290

[muziqaz]

alpha page still on 8.4.8