AMQ-9731: Upgrade to Spring 6.1.21 (#1458)

Author: jbonofre

pom.xml

@@ -95,7 +95,7 @@
     <shiro-version>1.13.0</shiro-version>
     <slf4j-version>2.0.16</slf4j-version>
     <snappy-version>1.1.2</snappy-version>
-    <spring-version>6.1.20</spring-version>
+    <spring-version>6.1.21</spring-version>
     <spring-version-range>[6,7)</spring-version-range>
     <taglibs-version>1.2.5</taglibs-version>
     <velocity-version>2.4.1</velocity-version>