Upgrade to Logback 1.5.21.

Closes: #2719

Author: christophstrobl

parent/pom.xml

@@ -118,7 +118,7 @@
 		<junit5>5.11.4</junit5>
 		<kotlin>1.9.25</kotlin>
 		<kotlin-coroutines>1.9.0</kotlin-coroutines>
-		<logback>1.5.20</logback>
+		<logback>1.5.21</logback>
 		<micrometer>1.14.13</micrometer>
 		<micrometer-tracing>1.4.12</micrometer-tracing>
 		<mockito>5.14.2</mockito>