MPT-21857 pin SonarCloud scan action version

[d3rky]

🤖 AI-generated PR — Please review carefully.

What changed

• Pinned SonarSource/sonarqube-scan-action to v8.0.0 in PR validation workflow.
• Pinned SonarSource/sonarqube-scan-action to v8.0.0 in main/release push workflow.
• Verified every GitHub Actions uses reference under .github/workflows is versioned and no longer points to master/main.

Testing

• make check-all

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository YAML (base), Organization UI (inherited)

Review profile: CHILL

Plan: Pro

Run ID: f4d2858b-cc11-44fd-9d35-a6914adaa89f

📥 Commits

Reviewing files that changed from the base of the PR and between 1d8addd and a5e24c8.

📒 Files selected for processing (2)

• .github/workflows/pull-request.yml
• .github/workflows/push-release-branch.yml

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_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[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