[Snyk] Security upgrade io.streamnative:pulsar-broker from 3.0.0.1 to v2.8.0-rc-202106091140

[BewareMyPower]

This PR was automatically created by Snyk using the credentials of a real user.

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:
  • pom.xml

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	451/1000 Why? Recently disclosed, Has a fix available, CVSS 3.3	Creation of Temporary File in Directory with Insecure Permissions SNYK-JAVA-COMGOOGLEGUAVA-5710356	io.streamnative:pulsar-broker: 3.0.0.1 -> v2.8.0-rc-202106091140	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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🦉 Creation of Temporary File in Directory with Insecure Permissions

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[github-actions]

@BewareMyPower:Thanks for your contribution. For this PR, do we need to update docs?
(The PR template contains info about doc, which helps others know more about the changes. Can you provide doc-related info in this and future PR descriptions? Thanks)