Update os-release to reflect new codename "Twenty-Six"

[ericbsd]

Resolve ghostbsd/issues#211

Summary by Sourcery

Bug Fixes:

• Align os-release metadata with the new "Twenty-Six" codename to keep system identification accurate.

[github-actions]

Thank you for taking the time to contribute to FreeBSD!
There is an issue that needs to be fixed:

• Missing Signed-off-by lines^7af5a1d

Please review CONTRIBUTING.md, then update and push your branch again.

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