deps(mount): update fastapi requirement from >=0.139.0 to >=0.139.2 in /mount in the mount-deps group

[dependabot]

Updates the requirements on fastapi to permit the latest version.
Updates fastapi to 0.139.2

Release notes

Sourced from fastapi's releases.

0.139.2

Fixes

• 🐛 Refactor router route building to make it thread-safe, mainly relevant for tests running in parallel threads (uncommon). PR #16013 by @​tiangolo.

Commits

• 866b7a3 🔖 Release version 0.139.2 (#16014)
• 7b3effe 📝 Update release notes
• 7fe315c 🐛 Refactor router route building to make it thread-safe, mainly relevant for ...
• c48e67b 🔖 Release version 0.139.1 (#16012)
• 2acc4fb 📝 Update release notes
• eb75fd0 🐛 Fix frontend fallback support for doted paths like /users/john.doe (#16011)
• 9b8410b 📝 Update release notes
• e24d44c 📝 Fix topic repository list not being displayed and skip_users not being ap...
• 93b78f8 📝 Update release notes
• b959b44 📝 Update release notes
• Additional commits viewable in compare view

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[stepsecurity-app]

Security Policy Alert: Harden Runner Policy Violation

This workflow run has been blocked by StepSecurity's Harden Runner policy.

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Update the affected jobs so Harden Runner is initialized before any other action or command runs.

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