fix(deps): update dependency io.sentry:sentry-spring-boot-starter-jakarta to v7.21.0

Author: renovate[bot]

Backend/pom.xml

@@ -88,7 +88,7 @@
         <dependency>
             <groupId>io.sentry</groupId>
             <artifactId>sentry-spring-boot-starter-jakarta</artifactId>
-            <version>7.15.0</version>
+            <version>7.21.0</version>
         </dependency>
 
         <!-- Utilities -->