ci: Change release-please to GitHub Action

[holtskinner]

• release-please GitHub App is being turned down on August 15, 2025

[gemini-code-assist]

Summary of Changes

Hello @holtskinner, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request begins the process of updating the project's automated release mechanism. It removes the existing configuration for the release-please GitHub App, which is scheduled for deprecation, thereby preparing the repository for a new, GitHub Action-driven release workflow to maintain continuous integration and delivery practices.

Highlights

• Release Automation Migration: Initiating the migration of the project's release automation from the release-please GitHub App to a GitHub Action-based approach, in anticipation of the App's deprecation.
• Configuration Removal: Removing the legacy configuration files (.github/release-please.yml and .github/release-trigger.yml) that were used by the release-please GitHub App.

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[gemini-code-assist]

Code Review

This pull request aims to migrate from the release-please GitHub App to the corresponding GitHub Action, which is a necessary change as the app is being deprecated. The changes correctly remove the configuration files for the old app. However, the new GitHub Action workflow that should replace it is missing from this PR. This omission is critical as it will break the release process. Please add the new workflow file to complete the migration.