Use new Mastodon account for PyCon Australia

Author: bardiharborow

_data/conferences.yml

@@ -499,7 +499,7 @@
   start: 2025-09-12
   end: 2025-09-16
   sponsor: https://2025.pycon.org.au/sponsor/
-  mastodon: https://fosstodon.org/@pyconau
+  mastodon: https://mastodon.pycon.org.au/@pyconau
   sub: PY
   location:
   - title: PyCon Australia 2025
@@ -863,7 +863,7 @@
   place: Brisbane, Australia
   start: 2026-08-26
   end: 2026-08-30
-  mastodon: https://fosstodon.org/@pyconau
+  mastodon: https://mastodon.pycon.org.au/@pyconau
   bluesky: https://bsky.app/profile/pyconau.bsky.social
   sub: PY
   location: