Bump transport from 6.7.0 to 6.7.1 in /modules/elasticsearch (testcontainers#1370)

Bumps [transport](https://github.com/elastic/elasticsearch) from 6.7.0 to 6.7.1.
- [Release notes](https://github.com/elastic/elasticsearch/releases)
- [Commits](elastic/elasticsearch@v6.7.0...v6.7.1)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

modules/elasticsearch/build.gradle

@@ -3,5 +3,5 @@ description = "TestContainers :: elasticsearch"
 dependencies {
     compile project(':testcontainers')
     testCompile "org.elasticsearch.client:elasticsearch-rest-client:6.7.1"
-    testCompile "org.elasticsearch.client:transport:6.7.0"
+    testCompile "org.elasticsearch.client:transport:6.7.1"
 }