fix: update Apache Superset website footer copyright year

[Tilakmahajan]

Fixes #37432
This PR updates the Apache Superset website footer to reflect the current year.

The copyright year in the i18n footer translation file was outdated.
This change updates it to the current year, fixing the public website footer.

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[Copilot]

Pull request overview

This PR updates the Apache Superset website footer i18n translation so the copyright year reflects 2026, aligning the public site footer with the current year and the reported bug.

Changes:

• Updated the copyright.message HTML string in docs/i18n/en/docusaurus-theme-classic/footer.json to replace 2024 with 2026.

[rusackas]

I'm fine with the update, but maybe we should use a little inline JS or something to make it dynamic so we don't have to update it again?

[Tilakmahajan]

I looked into this while debugging the issue — since the footer content is coming from the i18n footer.json, JavaScript can’t be evaluated there directly.

A dynamic solution would likely require a custom footer component or theme override to inject the current year at render time. If that sounds reasonable, I’m happy to explore a follow-up PR in that direction.