Add Heisenbug 2026 Spring conference

[Copilot]

Pull Request Template: Add a Conference or Workshop

Conference/Workshop Details

• Name, Location, Date(s), Website URL and Status are required
• X / Twitter is Optional
• Location should be City + Country or Online
• Status can include information about registration, pricing, calls for proposals and can include links to all the above.

Conference: Heisenbug 2026 Spring
Dates: April 27-28, 2026
Location: Moscow, Russia and Online
Website: https://heisenbug.ru/en/
Status: Registration is Open

Checklist

• I have added the conference/workshop to the correct YAML file (_data/current.yml or _data/past.yml)
• The entry includes name, location, date(s), url and accurate status
• The entry is in chronological order (soonest to furtherest away)
• If there are any special characters in the name field (: or ; or '), the name must be in quotes (")
• I have checked for duplicates to avoid listing the same event twice
• Build runs successfully

Additional context

Heisenbug is Russia's largest QA/software testing conference. Added entry positioned chronologically between STAREAST 2026 (April 26) and Romania QualityConnect 2026 (May 6-7). Entry includes utm_source tracking and registration link consistent with existing entries.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add Heisenbug 2026 Spring</issue_title>
<issue_description>1. Scan this website for details on Heisenbug 2026 conference: https://heisenbug.ru/en/
2. Add it to the active list</issue_description>

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

• Fixes Add Heisenbug 2026 Spring #837

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