misc: Increase timeout for GitHub Actions

This increases the timeout for our compiler tests, and for
the very-long runs in our weekly tests.

Change-Id: I027d2e98ce5596430ffcb20ef484e1cd7d4f644b
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/71501
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
2 files changed