linux-yocto/6.12: update CVE exclusions (6.12.40)

linux-yocto/6.12: update CVE exclusions (6.12.40)

Data pulled from: https://github.com/CVEProject/cvelistV5

    1/1 [
        Author: cvelistV5 Github Action
        Email: github_action@example.com
        Subject: 4 changes (1 new | 3 updated): - 1 new CVEs: CVE-2025-8126 - 3 updated CVEs: CVE-2025-31952, CVE-2025-31953, CVE-2025-31955
        Date: Fri, 25 Jul 2025 02:18:30 +0000

    ]

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit e504bd7a9e908be0937d6fc9f6b9699b0acdc2aa)
Signed-off-by: Steve Sakoman <steve@sakoman.com>