Version 1.2.1 of resources module module-b.

To use this version of the module, set the source argument of the module call to the following value.
git::ssh://git@github.com/ryan-at-ld/gha-tf-module-testing//resources/module-b?ref=module-b/1.2.1.

This release was generated by run 139 of the "Module Versioning" workflow after pull request #22 was merged.