[maven-release-plugin] prepare release v5.3.0-rc2

[maven-release-plugin] copy for tag v5.3.0-rc2

[maven-release-plugin] copy for tag v5.3.0-rc1

[maven-release-plugin] copy for tag v5.3.0-beta1

[maven-release-plugin] copy for tag wso2appserver-parent-6.0.0