Update logback monorepo to v1.5.21

Author: github-actions[bot]

pom.xml

@@ -87,7 +87,7 @@
         <guice.version>6.0.0</guice.version>
 
         <slf4j.version>2.0.17</slf4j.version>
-        <logback.version>1.5.20</logback.version>
+        <logback.version>1.5.21</logback.version>
 
         <!-- test -->
         <junit.version>6.0.1</junit.version>