Use faster timeout on cmdlineargs test that relies on timeout

[IanButterworth]

Otherwise this test takes 1 minute doing nothing before the worker times out and satisfies the error throw.
i.e. locally

julia> run(`$(Base.julia_cmd()) --worker=true`)
julia_worker:9616#192.168.12.246
Master process (id 1) could not connect within 60.0 seconds.
exiting.

julia> withenv("JULIA_WORKER_TIMEOUT" => "5") do
       run(`$(Base.julia_cmd()) --worker=true`)
       end
julia_worker:9708#192.168.12.246
Master process (id 1) could not connect within 5.0 seconds.
exiting.

[vtjnash]

It may need to slightly longer to be an accurate test, since some CI is slow and there is a sleep(2) in the worker code before they finish connecting that adds even delay to a normally functioning launch