Update footer copyright and super footer to 2026

[Copilot]

Conference/Workshop Details

N/A - This PR updates site footer content, not conference/workshop data.

Checklist

• Build runs successfully
• Code review passed with no issues
• Security scan completed

Changes

Updated footer to reflect 2026:

Copyright notice (_includes/footer.html line 33):

• © 2015 - 2025 → © 2015 - 2026

Super footer description (_includes/footer.html line 40):

• "workshops happening in 2025 and beyond" → "workshops happening in 2026 and beyond"

Additional context

Minimal text-only changes to keep site current for the new year. No structural or functional modifications.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Update footer copyright and super footer</issue_title>
<issue_description>1. Update the footer copyright to be 2015 - 2026
2. Update the super footer sentence to be "An open source, up to date, community driven list of software testing conferences and software testing workshops happening in 2026 and beyond."
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Update footer copyright and super footer #822

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