add template to sent trigger version

[ahms5]

Which issue(s) are closed by this pull request?

contributes to automatically apply tempalte changes to all pyfar repos

Changes proposed in this pull request:

• sent a trigger once a new version tag is created
• this follows the documentation by https://github.com/peter-evans/repository-dispatch
• not possible to test unless we do it in production.
• this will trigger this pipeline: add action to create pr in other repos if this repo has a new version #56

[Copilot]

Pull request overview

Adds a GitHub Actions workflow to fan out a “new template version” signal to multiple pyfar/* repositories whenever a new version tag is pushed.

Changes:

• Introduces a new workflow triggered on version tag pushes.
• Uses peter-evans/repository-dispatch to send a new-template-version event to a matrix of target repos.

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