[#dependabot] Bump org.testng:testng from 6.14.3 to 7.5.1 (#1592)

Bumps [org.testng:testng](https://github.com/cbeust/testng) from 6.14.3 to 7.5.1.

pom.xml

@@ -177,7 +177,7 @@
         <dep.log4j.version>2.17.1</dep.log4j.version>
         <dep.mockito.version>2.21.0</dep.mockito.version>
         <dep.okapi.version>0.2.4-SNAPSHOT</dep.okapi.version>
-        <dep.testng.version>6.14.3</dep.testng.version>
+        <dep.testng.version>7.5.1</dep.testng.version>
 
         <log4j.properties>log4j-test.properties</log4j.properties>
         <argLine>-Xmx1G -Dlog4j.configuration=${log4j.properties}</argLine>