Bump testng from 7.3.0 to 7.4.0 in /examples

Bumps [testng](https://github.com/cbeust/testng) from 7.3.0 to 7.4.0.
- [Release notes](https://github.com/cbeust/testng/releases)
- [Changelog](https://github.com/cbeust/testng/blob/master/CHANGES.txt)
- [Commits](testng-team/testng@7.3.0...7.4.0)

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

Author: dependabot[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:7.3.0'
+    testImplementation 'org.testng:testng:7.4.0'
     testImplementation 'org.rnorth.visible-assertions:visible-assertions:2.1.2'
 }