Update Semgrep diff scan workflow

[devin-ai-integration]

Update Semgrep diff scan workflow

This PR updates the semgrep-scan-diff.yaml workflow file in the .github/workflows directory. The update improves the baseline reference handling to work with different branch configurations.

Changes

• Updated .github/workflows/semgrep-scan-diff.yaml file with improved baseline reference handling
• Changed echo "SEMGREP_BASELINE_REF=origin/${GITHUB_BASE_REF}" >> $GITHUB_ENV to echo "SEMGREP_BASELINE_REF=origin/${{ github.base_ref || 'main' }}" >> $GITHUB_ENV

Link to Devin run: https://app.devin.ai/sessions/d37cced4d4734ea88e68038ddf79fb0b
Requested by: shashvat@zamp.ai

[devin-ai-integration]

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[devin-ai-integration]

Closing due to inactivity for more than 7 days.