Upgrade to Logback 1.5.21.

Closes: #2719

Author: christophstrobl

parent/pom.xml

@@ -119,7 +119,7 @@
 		<junit5>5.12.2</junit5>
 		<kotlin>1.9.25</kotlin>
 		<kotlin-coroutines>1.9.0</kotlin-coroutines>
-		<logback>1.5.20</logback>
+		<logback>1.5.21</logback>
 		<microbenchmark>0.5.0.RELEASE</microbenchmark>
 		<micrometer>1.15.6</micrometer>
 		<micrometer-tracing>1.5.6</micrometer-tracing>