sysutils/firstboot-freebsd-update: HTTP_TIMEOUT=5

If a system with firstboot_freebsd_update_enable="YES" boots without
access to the FreeBSD Update mirrors (e.g. an EC2 instance which has
an EC2 security group settings which block outbound HTTP) the boot
will hang until it times out. The default timeout of 120 seconds is
suboptimal.

Run freebsd-update with a timeout of 5 seconds, and bump the package
version to 1.4 to reflect this change.

Reported by: mgrooms@shrew.net
PR: 276720
Sponsored by: https://www.patreon.com/cperciva