Bump assertj-core from 3.18.1 to 3.19.0

Bumps [assertj-core](https://github.com/assertj/assertj-core) from 3.18.1 to 3.19.0.
- [Release notes](https://github.com/assertj/assertj-core/releases)
- [Commits](assertj/assertj@assertj-core-3.18.1...assertj-core-3.19.0)

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

build.gradle

@@ -49,7 +49,7 @@ dependencies {
     testCompile ("org.apache.jclouds:jclouds-core:${jcloudsVersion}:tests")
     testCompile ("org.apache.jclouds.driver:jclouds-slf4j:${jcloudsVersion}")
     testCompile ('org.testng:testng:7.3.0')
-    testCompile ('org.assertj:assertj-core:3.18.1')
+    testCompile ('org.assertj:assertj-core:3.19.0')
     testCompile ('com.squareup.okhttp:mockwebserver:2.7.5')
     testCompile ('ch.qos.logback:logback-core:1.2.3')
     testCompile ('ch.qos.logback:logback-classic:1.2.3')