Bump testng from 7.3.0 to 7.5.1

Bumps [testng](https://github.com/cbeust/testng) from 7.3.0 to 7.5.1.
- [Release notes](https://github.com/cbeust/testng/releases)
- [Changelog](https://github.com/testng-team/testng/blob/master/CHANGES.txt)
- [Commits](testng-team/testng@7.3.0...7.5.1)

---
updated-dependencies:
- dependency-name: org.testng:testng
  dependency-type: direct:production
...

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

pom.xml

@@ -223,7 +223,7 @@
         <okio.version>1.15.0</okio.version>
 
         <!-- Test dependencies -->
-        <testng.version>7.3.0</testng.version>
+        <testng.version>7.5.1</testng.version>
         <mockito.version>2.7.12</mockito.version>
         <assertj.version>3.11.1</assertj.version>
         <cobertura.plugin.version>2.7</cobertura.plugin.version>