Bump testng from 7.1.0 to 7.5.1 in /ui-tests (#55)

Bumps [testng](https://github.com/cbeust/testng) from 7.1.0 to 7.5.1.
- [Release notes](https://github.com/cbeust/testng/releases)
- [Changelog](https://github.com/testng-team/testng/blob/master/CHANGES.txt)
- [Commits](https://github.com/cbeust/testng/commits/7.5.1)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

ui-tests/pom.xml

@@ -25,7 +25,7 @@
         <thread.count></thread.count>
 
         <selenide.version>5.17.2</selenide.version>
-        <testng.version>7.1.0</testng.version>
+        <testng.version>7.5.1</testng.version>
         <maven.surefire.plugin>2.22.2</maven.surefire.plugin>
         <maven.compiler.plugin>3.8.1</maven.compiler.plugin>
         <maven.checkstyle.plugin>3.1.1</maven.checkstyle.plugin>