dashboard: allow 45 minutes for 386 OpenBSD builds
dashboard: allow 45 minutes for 386 OpenBSD builds

We retry these forever, so regardless of how you feel about the speed of
the build, letting them finish is better than that.

Fixes golang/go#49666.

Change-Id: Id5f9e1124f77047bcc6c73675f47c2acd90231b3
Reviewed-on: https://go-review.googlesource.com/c/build/+/382978
Trust: Heschi Kreinick <e89ab2b172855aa0ad01c40c4d8a3535a61ac68a@google.com>
Run-TryBot: Heschi Kreinick <e89ab2b172855aa0ad01c40c4d8a3535a61ac68a@google.com>
Reviewed-by: Dmitri Shuralyov <d181b7fea0ec87c86ba5a890ab716db52498e3ba@golang.org>
TryBot-Result: Gopher Robot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

golang/build,golang/build,golang/build,golang/build