Keep GitHub Actions up to date with GitHub's Dependabot

[cclauss]

Fixes many of the warnings at the bottom right of https://github.com/grafana/pyroscope-nodejs/actions/runs/8062694432

• https://docs.github.com/en/code-security/dependabot/working-with-dependabot/keeping-your-actions-up-to-date-with-dependabot
• https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#package-ecosystem

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All committers have signed the CLA.

[cclauss]

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