tests: Increase jenkins test timeout to 4 hours.

Change-Id: I11d36a429254df01a46040325baff5b7d18e22b3
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/23463
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
1 file changed