fix: pass github_token to semantic release step

[salman2013]

Summary

• Adds github_token: ${{ secrets.GITHUB_TOKEN }} to the Python Semantic Release step in release.yml

Problem

Semantic release was getting a 401 Unauthorized error when trying to create the GitHub release:

401 Client Error: Unauthorized for url: https://api.github.com/repos/openedx/xblock-sdk/releases
Failed to create release on Github!

Cause

The github_token input was not passed to the action, so semantic release had no credentials to authenticate against the GitHub API.

Test plan

• Verify semantic release workflow completes successfully and creates a GitHub release

🤖 Generated with Claude Code

[openedx-webhooks]

Thanks for the pull request, @salman2013!

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