Update PagerDuty token in workflow file to Org Token

[jonrohan]

Update the PagerDuty token to use the shared token. Noticed the current token is failing https://github.com/primer/react/actions/runs/18855171295/job/53801102881

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Pull Request Overview

This PR updates the PagerDuty API token reference in the GitHub Actions workflow to use a shared organization token instead of the previous token which was failing.

Key Changes:

• Updated the PagerDuty token secret reference from PAGERDUTY_API_KEY_SID to PAGERDUTY_TOKEN_SHARED to resolve authentication failures