fix: anchor regex for determining config_version

[TheMeier]

fixes #553

[puppet-community-rangefinder]

kubernetes::config::kubeadm is a class

that may have no external impact to Forge modules.

This module is declared in 0 of 579 indexed public Puppetfiles.

---

These results were generated with Rangefinder, a tool that helps predict the downstream impact of breaking changes to elements used in Puppet modules. You can run this on the command line to get a full report.

Exact matches are those that we can positively identify via namespace and the declaring modules' metadata. Non-namespaced items, such as Puppet 3.x functions, will always be reported as near matches only.