Update IROS 2026 paper video submission deadline

Corrected the paper video submission deadline for IROS 2026 from March 5, 2026 to March 7, 2026 based on the official conference website (https://2026.ieee-iros.org/about/important-dates/).

The previous date (March 5) was actually the deadline for modifying existing paper submissions, not for video submission.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/data/conferences/iros.yml

@@ -37,7 +37,7 @@
       timezone: AoE
     - type: paper
       label: Paper video submission deadline
-      date: '2026-03-05 23:59:59'
+      date: '2026-03-07 23:59:59'
       timezone: AoE
     - type: notification
       label: Paper acceptance notification