Bump testng from 6.14.3 to 7.4.0 (#62)

Bumps [testng](https://github.com/cbeust/testng) from 6.14.3 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@6.14.3...7.4.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Tobias Stamann <tobias.stamann@holisticon.de>

Author: dependabot-preview[bot]

pom.xml

@@ -85,8 +85,7 @@
         <!-- versions of test dependencies -->
         <junit4.version>4.13.1</junit4.version>
         <junit5.version>5.7.2</junit5.version>
-        <testng.version>6.14.3</testng.version>
-
+        <testng.version>7.4.0</testng.version>
         <hamcrest.version>2.2</hamcrest.version>
         <mockito.version>2.28.2</mockito.version>