Update revision to 4.0.8 in newvers.sh

[laffer1]

bumping after advisories

Summary by Sourcery

Chores:

• Bump the MidnightBSD release revision to 4.0.8.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the generated MidnightBSD release revision from 4.0.7 to 4.0.8 in the version-generation script, with RELEASE and VERSION continuing to derive automatically from that value.

File-Level Changes

Change	Details	Files
Bump the MidnightBSD release revision used to generate version metadata.	Change the revision from 4.0.7 to 4.0.8. Keep release and version values derived from the updated revision.	sys/conf/newvers.sh

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Pull request overview

Updates the MidnightBSD release revision in newvers.sh to reflect the next 4.0.x revision, aligning the generated version string used across the system build/version metadata.

Changes:

• Bump REVISION from 4.0.7 to 4.0.8.

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