Bump spring-framework-bom from 5.3.20 to 5.3.21 (#3088)

diff --git a/dependencies/default/pom.xml b/dependencies/default/pom.xml
index d0e630f..f4ef802 100644
--- a/dependencies/default/pom.xml
+++ b/dependencies/default/pom.xml
@@ -94,7 +94,7 @@
     <slf4j.version>1.7.36</slf4j.version>
     <snakeyaml.version>1.30</snakeyaml.version>
     <spectator.version>1.3.5</spectator.version>
-    <spring.version>5.3.20</spring.version>
+    <spring.version>5.3.21</spring.version>
     <spring-boot.version>2.6.7</spring-boot.version>
     <swagger.version>1.6.6</swagger.version>
     <swagger2markup.version>1.3.3</swagger2markup.version>