Conference updates (#411)

* chore: enrich TBA conferences with CFP data

Enrichment level: quick

Triggered: 2026-08-06T08:42:05Z

* chore: enrich TBA conferences with CFP data

Enrichment level: quick

Triggered: 2026-08-08T06:59:00Z

* chore: enrich TBA conferences with CFP data

Enrichment level: quick

Triggered: 2026-08-15T06:42:25Z

---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Jesper Dramsch <jesper@dramsch.net>

Author: github-actions[bot]

_data/conferences.yml

@@ -802,6 +802,7 @@
   start: 2026-12-19
   end: 2026-12-20
   sponsor: https://scipy.in/2026/sponsor.html
+  mastodon: https://fosstodon.org/@scipyindia
   bluesky: https://bsky.app/profile/scipy.in
   youtube: https://www.youtube.com/@scipy-india
   sub: SCIPY
@@ -855,6 +856,7 @@
   place: Tallinn, Estonia
   start: 2026-10-08
   end: 2026-10-09
+  sponsor: https://pycon.ee/#sponsors
   sub: PY
   location:
   - title: PyCon Estonia 2026