Update to Dakota 6.20

[andreas-el]

https://snl-dakota.github.io/docs/6.20.0/users/setupdakota.html#download-dakota

[andreas-el]

Building Dakota using boost 1.84.0 seems to be okay, but for some reason it stalls completely when installing sources and libs. The end result is that the set timeout is reached and the job cancelled.

-- Installing: /Users/runner/work/Carolina/Carolina/local/bin/pyprepro
-- Installing: /Users/runner/work/Carolina/Carolina/local/bin/pyprepro.py
-- Installing: /Users/runner/work/Carolina/Carolina/local/bin/dprepro
-- Installing: /Users/runner/work/Carolina/Carolina/local/bin/dprepro3
-- Installing: /Users/runner/work/Carolina/Carolina/local/bin/dprepro.py
-- Installing: /Users/runner/work/Carolina/Carolina/local/bin/dakota.sh
-- Installing: /Users/runner/work/Carolina/Carolina/local/bin/dakota-ui.sh
Error: The action 'Build dakota' has timed out after 30 minutes.

The actual Dakota build takes ~10 minutes, so something is not right here.

[andreas-el]

We have decided to postpone this upgrade and wait for the upcoming Dakota release later in 2024.