Update slf4j monorepo to v2.0.15

Author: renovate[bot]

integration-testing/build.gradle

@@ -19,9 +19,9 @@ repositories {
 dependencies {
     implementation 'io.kubernetes:client-java:18.0.1'
     implementation 'org.awaitility:awaitility:4.2.0'
-    implementation 'org.slf4j:slf4j-api:2.0.11'
+    implementation 'org.slf4j:slf4j-api:2.0.15'
     implementation 'org.zeroturnaround:zt-exec:1.12'
     testImplementation 'org.junit.jupiter:junit-jupiter:5.10.1'
-    testImplementation 'org.slf4j:slf4j-simple:2.0.11'
+    testImplementation 'org.slf4j:slf4j-simple:2.0.15'
 }