SSL cert expired

[oliver-was-here]

This is isn't technically an issue with this repo, however, I am unsure of the best means of contacting the grails-plugins group.

It would seem the SSL cert for https://repo.grails.org/grails/ has expired which is causing Gradle to fail when resolving the "org.grails.plugins:dropwizard-metrics:1.0.0.BUILD-SNAPSHOT" dependency.

Here's the exception logged when running gradle clean

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring root project 'developerPortal'.
> Could not resolve all dependencies for configuration ':runtime'.
   > Could not resolve org.grails.plugins:dropwizard-metrics:1.0.0.BUILD-SNAPSHOT.
     Required by:
         project :
      > Could not resolve org.grails.plugins:dropwizard-metrics:1.0.0.BUILD-SNAPSHOT.
         > Unable to load Maven meta-data from https://repo.grails.org/grails/core/org/grails/plugins/dropwizard-metrics/1.0.0.BUILD-SNAPSHOT/maven-metadata.xml.
            > Could not GET 'https://repo.grails.org/grails/core/org/grails/plugins/dropwizard-metrics/1.0.0.BUILD-SNAPSHOT/maven-metadata.xml'.
               > sun.security.validator.ValidatorException: PKIX path validation failed: java.security.cert.CertPathValidatorException: timestamp check failed