[Snyk] Security upgrade mysql:mysql-connector-java from 8.0.16 to 8.0.31

[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:
  • pom.xml

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	571/1000 Why? Recently disclosed, Has a fix available, CVSS 5.7	Denial of Service (DoS) SNYK-JAVA-COMGOOGLEPROTOBUF-3040284	mysql:mysql-connector-java: 8.0.16 -> 8.0.31	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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[AppVeyorBot]

:x: Build validation-manager VM master build 188 failed (commit https://github.com/javydreamercsw/validation-manager/commit/1cea5f3d52 by @snyk-bot)

[AppVeyorBot]

:x: Build validation-manager VM master build 188 failed (commit https://github.com/javydreamercsw/validation-manager/commit/1cea5f3d52 by @snyk-bot)