fix(deps): update dependency fastapi to v0.136.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
fastapi (changelog)	==0.136.1 → ==0.136.3

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Release Notes

fastapi/fastapi (fastapi)

v0.136.3

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Refactors

• ♻️ Do not accept underscore headers when using convert_underscores=True (the default). PR #​15589 by @​tiangolo.

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