Update IWST2025.pillar: fix place

fixed plase

Author: MarcusDenker

2025-Conference/IWST2025.pillar

@@ -5,7 +5,7 @@
 !IWST 25 Information and Call For Papers
 
 IWST 25 — International Workshop on Smalltalk Technologies
-Lille, France; July 1st to 4th, 2025
+Gdansk, Poland; July 1st to 4th, 2025
 Co-located with ESUG 2025
 
 !!! Program