Bump testcontainers.

Author: slinkydeveloper

gradle/libs.versions.toml

@@ -10,7 +10,7 @@
   mutiny = 'io.smallrye.reactive:mutiny:2.7.0'
   reactiverse-contextual-logging = 'io.reactiverse:reactiverse-contextual-logging:1.2.1'
   slf4j-nop = 'org.slf4j:slf4j-nop:2.0.16'
-  testcontainers = 'org.testcontainers:testcontainers:1.20.4'
+  testcontainers = 'org.testcontainers:testcontainers:1.21.4'
   tink = 'com.google.crypto.tink:tink:1.18.0'
   tomcat-annotations = 'org.apache.tomcat:annotations-api:6.0.53'
   bytebuddy = "net.bytebuddy:byte-buddy:1.18.3"