[backend] chore(deps): update logback monorepo to v1.5.21

Author: renovate[bot]

openaev-api/pom.xml

@@ -258,12 +258,12 @@
         <dependency>
             <groupId>ch.qos.logback</groupId>
             <artifactId>logback-classic</artifactId>
-            <version>1.5.18</version>
+            <version>1.5.21</version>
         </dependency>
         <dependency>
             <groupId>ch.qos.logback</groupId>
             <artifactId>logback-core</artifactId>
-            <version>1.5.19</version>
+            <version>1.5.21</version>
         </dependency>
         <dependency>
             <groupId>ch.qos.logback.contrib</groupId>