[Snyk] Security upgrade org.testng:testng from 6.8.8 to 7.3.0

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `maven` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • xll-examples/pom.xml

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	494/1000 Why? Has a fix available, CVSS 5.6	Unsafe Dependency Resolution SNYK-JAVA-COMBEUST-174815	org.testng:testng: 6.8.8 -> 7.3.0	Yes	No Known Exploit
	494/1000 Why? Has a fix available, CVSS 5.6	Unsafe Dependency Resolution SNYK-JAVA-ORGTESTNG-174823	org.testng:testng: 6.8.8 -> 7.3.0	Yes	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

Check the changes in this PR to ensure they won't cause issues with your project.

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