deps: Update fastmcp to remove 3 vulnerabilities in requirements.txt

[BacklineAI]

🔐 Security Vulnerability Fixes

✅ This pull request was created and verified by Backline to fix security vulnerabilities in your dependencies.
We recently conducted research to identify high-impact OSS projects that contribute significantly to the community. As part of this, we ran microsoft-UFO through our platform to see if we could help clear out any lingering security vulnerabilities.

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📦 Package Updates & Vulnerability Fixes

fastmcp

v2.11.3 → 2.14.0

• 🟧 GHSA-c2jp-c369-7pvx - FastMCP Auth Integration Allows for Confused Deputy Account Takeover.
• 🟨 CVE-2025-62800 - FastMCP vulnerable to reflected XSS in client's callback page.
• 🟨 CVE-2025-62801 - FastMCP vulnerable to windows command injection in FastMCP Cursor installer via server_name.

^{Legend: 🟥 Critical | 🟧 High | 🟨 Medium | 🟦 Low}

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