changelog: entry for 0.26

[kradalby]

No description provided.

[ghost]

Pull Request Revisions

Revision	Description
r2	Headscale version updated to 0.26.0 Updated Headscale version in mkdocs.yml configuration from 0.25.0 to 0.26.0
r1	Policy V2 migration with environment variable Introduced policy V2 migration process with specific steps for database-stored policies and environment variable handling

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[ghost]

The release date in the CHANGELOG.md matches today's date (2025-05-14), which means it's being released on the same day as the commit. Is this intentional? Typically, there's a short delay between finalizing the changelog and the actual release to allow for final testing.