Bump mockserver from 1.12.3 to 1.12.4 in /modules/testcontainers

Bumps [mockserver](https://github.com/testcontainers/testcontainers-java) from 1.12.3 to 1.12.4.
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/master/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-java@1.12.3...1.12.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

modules/testcontainers/build.gradle

@@ -6,7 +6,7 @@ dependencies {
   compile 'org.testcontainers:junit-jupiter:1.12.4'
   testCompile 'org.eclipse.microprofile.rest.client:microprofile-rest-client-api:1.3.4'
   testCompile 'org.slf4j:slf4j-log4j12:1.7.29'
-  testCompile 'org.testcontainers:mockserver:1.12.3'
+  testCompile 'org.testcontainers:mockserver:1.12.4'
   testImplementation 'org.junit.jupiter:junit-jupiter:5.5.2'
 }