Bump testng from 7.1.1 to 7.2.0 in /examples (testcontainers#2441)

Bumps [testng](https://github.com/cbeust/testng) from 7.1.1 to 7.2.0.
- [Release notes](https://github.com/cbeust/testng/releases)
- [Changelog](https://github.com/cbeust/testng/blob/master/CHANGES.txt)
- [Commits](https://github.com/cbeust/testng/commits)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

examples/redis-backed-cache-testng/build.gradle

@@ -13,7 +13,7 @@ dependencies {
     implementation 'com.google.guava:guava:23.0'
     testImplementation 'org.testcontainers:testcontainers'
     testImplementation 'ch.qos.logback:logback-classic:1.2.3'
-    testImplementation 'org.testng:testng:7.1.1'
+    testImplementation 'org.testng:testng:7.2.0'
 }
 
 test {