[Snyk] Fix for 2 vulnerabilities

[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:
  • src/it/TEST-28/pom.xml

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	489/1000 Why? Has a fix available, CVSS 5.5	Information Disclosure SNYK-JAVA-COMGOOGLEGUAVA-1015415	io.grpc:grpc-protobuf: 1.7.0 -> 1.21.0 io.grpc:grpc-stub: 1.7.0 -> 1.21.0	No	No Known Exploit
	509/1000 Why? Has a fix available, CVSS 5.9	Deserialization of Untrusted Data SNYK-JAVA-COMGOOGLEGUAVA-32236	io.grpc:grpc-protobuf: 1.7.0 -> 1.21.0 io.grpc:grpc-stub: 1.7.0 -> 1.21.0	No	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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