Update slf4j monorepo to v2.0.15

Author: renovate[bot]

pom.xml

@@ -89,7 +89,7 @@
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-api</artifactId>
-            <version>2.0.13</version>
+            <version>2.0.15</version>
         </dependency>
 
         <dependency>
@@ -102,7 +102,7 @@
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-log4j12</artifactId>
-            <version>2.0.13</version>
+            <version>2.0.15</version>
             <scope>test</scope>
         </dependency>
     </dependencies>