add Swiss Python Summit 2025

Author: systematicguy

_data/conferences.yml

@@ -1,4 +1,18 @@
 ---
+- conference: Swiss Python Summit
+  year: 2025
+  link: https://www.python-summit.ch/
+  timezone: Europe/Zurich
+  place: Rapperswil, Switzerland
+  start: 2025-10-16
+  end: 2025-10-17
+  sponsor: https://www.python-summit.ch/sponsoring/
+  twitter: pythonsummit
+  sub: PY
+  note: Day 1: General Language Topics; Day 2: Data Science Topics
+  location:
+      latitude: 47.223987
+      longitude: 8.817300
 
 - conference: Xtreme Python
   year: 2025