chore: tell dependabot to use the pnpm ecosystem for updates

[gfellerph]

📄 Description

Dependabot opened a PR that failed all checks because it did not update the lockfile (#6683). Adding this config should tell dependabot to use the pnpm ecosystem for updates and hopefully update the lockfile.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 80f3c92

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud