Use workflow dispatch for meta bump #6
Description
Right now we're using a repository dispatch to ping robotpy-meta. There's no reason to not be using a workflow dispatch instead to specifically target the bump workflow.
https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows#workflow_dispatch
https://docs.github.com/en/free-pro-team@latest/rest/reference/actions#create-a-workflow-dispatch-event