Bumped Spring version to 6.1.21 (CVE-2025-41234)

Change-Id: I3a066f63ed3146baf0dd1cb95885a4fb04b71560
diff --git a/pom.xml b/pom.xml
index 9ce5c08..377c069 100644
--- a/pom.xml
+++ b/pom.xml
@@ -11,7 +11,7 @@
 		<jersey.version>3.1.5</jersey.version>
 		<hibernate.ehcache.version>6.0.0.Alpha7</hibernate.ehcache.version>
 		<hibernate.version>6.1.7.Final</hibernate.version>
-		<spring.version>6.1.20</spring.version>
+		<spring.version>6.1.21</spring.version>
 		<!-- spring6.version is used in jersey and defined here 
 		to make sure that jersey uses the correct spring version-->
 		<spring6.version>${spring.version}</spring6.version>