chore(deps): update dependency anthropic to ^0.20.0

This MR contains the following updates:

Package	Type	Update	Change
anthropic	dependencies	minor	^0.19.0 -> ^0.20.0

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Release Notes

anthropics/anthropic-sdk-python (anthropic)

v0.20.0

Compare Source

Full Changelog: v0.19.2...v0.20.0

Features

• api: add haiku model (#​390) (43b57fc)

Documentation

• readme: mention vertex API (#​388) (8bb6b98)

v0.19.2

Compare Source

Full Changelog: v0.19.1...v0.19.2

Bug Fixes

• vertex: use correct auth scopes (#​385) (e4de056)

Chores

• export NOT_GIVEN sentinel value (#​379) (ba127bc)
• internal: improve deserialisation of discriminated unions (#​386) (fbc7e0b)
• internal: support parsing Annotated types (#​377) (f44efd5)

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