Security: Replace compromised Trivy scanner with Grype

[jultou-raa]

This PR urgently remediates a critical supply chain vulnerability by replacing the compromised aquasecurity/trivy-action with anchore/scan-action@v3 (Grype).

Key changes:

• Target the local docker image (docker.io/my-organization/my-app:${{ github.sha }})
• Set fail-build: true and severity-cutoff: high to block builds with Critical or High vulnerabilities.
• Export results in SARIF format and upload them to GitHub Security tab using github/codeql-action/upload-sarif@v3.

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PR created automatically by Jules for task 16054018810714170622 started by @jultou-raa

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.02%. Comparing base (2ccb144) to head (89d1585).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #28   +/-   ##
=======================================
  Coverage   98.02%   98.02%           
=======================================
  Files          10       10           
  Lines         911      911           
=======================================
  Hits          893      893           
  Misses         18       18           

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