Bump testng from 7.0.0 to 7.3.0 (#7047)

Bumps [testng](https://github.com/cbeust/testng) from 7.0.0 to 7.3.0.
- [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] <support@dependabot.com>

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

Author: dependabot-preview[bot]

build.gradle

@@ -5,7 +5,7 @@ buildscript {
 
   ext.reactiveStreamsVersion = "1.0.3"
   ext.junitVersion = "4.13"
-  ext.testNgVersion = "7.0.0"
+  ext.testNgVersion = "7.3.0"
   ext.mockitoVersion = "3.4.6"
   ext.jmhLibVersion = "1.21"
   ext.jmhGradleVersion = "0.5.0"