fix(deps): update dependency org.testcontainers:testcontainers-bom to v1.21.4

Author: renovate[bot]

gradle.properties

@@ -11,7 +11,7 @@ springDependencyManagementVersion=1.1.7
 
 # Testing versions
 jacocoVersion=0.8.13
-testcontainersVersion=1.21.1
+testcontainersVersion=1.21.4
 mockitoKotlinVersion=5.4.0
 
 # AWS SDK versions