Fix deprecated set-output command in GitHub Actions workflow

[devin-ai-integration]

Fix for deprecation warning in GitHub Actions workflow

Issue

This PR addresses issue #190 by replacing the deprecated set-output command in GitHub Actions workflow with the new environment file approach.

Changes

• Updated the command in ci.yml that sets the version output variable to use $GITHUB_OUTPUT environment file instead of the deprecated ::set-output command

References

• GitHub Actions: Deprecating save-state and set-output commands

Link to Devin run: https://app.devin.ai/sessions/07457c78325244f3b467fb6e135d96c0
Requested by: Toshihiro Nakamura

[devin-ai-integration]

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