conf: update Swiss Python Summit 2025 (#59)

* add Swiss Python Summit 2025

* fix: quote yaml string with colons

* merge swiss python summit 2025 entries

Author: systematicguy

_data/conferences.yml

@@ -1,5 +1,4 @@
 ---
-
 - conference: Xtreme Python
   year: 2025
   link: https://xtremepython.dev/2025/
@@ -446,12 +445,14 @@
   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:
-  - title: Swiss Python Summit 2024
-    latitude: 47.2266532
-    longitude: 8.8164042
+  - title: Swiss Python Summit 2025
+    latitude: 47.223987
+    longitude: 8.817300
 
 - conference: PyCon Japan
   alt_name: PyCon JP