[llvm] [DOCS][BUILDBOT] Bump recommended worker version (PR #144853)

[David Spickett via llvm-commits]

DavidSpickett wrote:

If you are using this worker version with llvm's master currently and it works, then this is fine.

Galina should be the approver though, because I know that the version used for the server right now is not the latest. Need to be sure it's compatible.

https://github.com/llvm/llvm-project/pull/144853