Bump FastAPI dependency

[igiloh-pinecone]

Problem

Sometimes canopy chat doesn't work

Solution

We have recently started using FastAPI's "lifespan" feature, which seems to be not backwards-compatible

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Infrastructure change (CI configs, etc)
• Non-code change (docs, etc)
• None of the above: (explain here)

Test Plan

Manually tested