Update security-fix-pr workflow to use camelCase parameter for GitHub MCP server

[Copilot]

The security-fix-pr workflow was calling get_code_scanning_alert with alert_number (snake_case), but the GitHub MCP server expects alertNumber (camelCase).

Changes

• Updated .github/workflows/security-fix-pr.md to use alertNumber parameter
• Recompiled workflow to update .github/workflows/security-fix-pr.lock.yml

The workflow already has max: 5 configured for concurrent autofix processing.

# Before
- `alert_number`: The alert number from step 1

# After
- `alertNumber`: The alert number from step 1

Original prompt

Update "security PR fix" with the latest tool signature from the github mcp server and allow to run 5 PR concurrently.

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