preliminaries.md: Add Utrecht

Author: mpsijm

content/preliminaries.md

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-The Preliminaries of the BAPC will be held between the 20th of September and 28th of September. 
+The Preliminaries of the BAPC will be held between the 20th of September and 28th of September.
 The following universities will be organizing a preliminary contest to select their teams for the BAPC 2025.
 ## 20 September 2025
 - Amsterdam Universities Programming Contest (Vrije Universiteit & University of Amsterdam)
@@ -16,4 +16,5 @@ The following universities will be organizing a preliminary contest to select th
 ## 27 September 2025
 - BAPC Preliminaries Nijmegen (Radboud University)
 - Eindhoven Algorithm Programming Contest (TU Eindhoven)
-- Leids Kampioenschap Programeren (University of Leiden & Leiden University of Applied Sciences)
+- Leidsch Kampioenschap Programmeren (University of Leiden & Leiden University of Applied Sciences)
+- Utrecht Kampieonschap Programmeren (Utrecht University)