SONARJAVA-6243 fix: use sonar-m-docker for dogfood

[hedinasr]

Part of https://sonarsource.atlassian.net/browse/BUILD-10889.

[hashicorp-vault-sonar-prod]

SONARJAVA-6243

[sonar-review-alpha]

Summary

Updates the GitHub Actions runner for the dogfood workflow from sonar-xs-public to sonar-m-docker. This is a single-line infrastructure change to the workflow configuration that upgrades the runner from an extra-small public instance to a medium-sized Docker runner, likely addressing resource or runner availability requirements.

What reviewers should know

What to review:

• Single file changed: .github/workflows/dogfood.yml
• One-line modification: runner specification in the dogfood_merge job
• No code logic affected; purely a CI/infrastructure adjustment

Context for reviewers:
This is a straightforward runner migration. If you need to understand why this specific runner change was needed, check the linked issue or PR discussion for context about resource constraints or runner deprecation that prompted this update.

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[sonarqube-next]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
0 Dependency risks
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarQube