ci: scope codeql permissions to analysis job

[mia03ther]

Summary

Scope CodeQL workflow permissions to the analysis job instead of granting security-events: write at the workflow level.

Motivation

zizmor reported that security-events: write was overly broad when configured globally. This change follows the principle of least privilege by limiting write access to only the job that uploads CodeQL analysis results.

Testing

• Ran zizmor .github/workflows/codeql.yml
• Verified the workflow permission change keeps CodeQL SARIF upload functionality unchanged

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