chore(deps): update dependency anthropic to ^0.21.0

This MR contains the following updates:

Package	Type	Update	Change
anthropic	dependencies	minor	^0.20.0 -> ^0.21.0

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Release Notes

anthropics/anthropic-sdk-python (anthropic)

v0.21.3

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Full Changelog: v0.21.2...v0.21.3

Bug Fixes

• types: correct typo claude-2.1' to claude-2.1 (#​400) (7f82aa3)
• types: correct typo claude-2.1' to claude-2.1 (#​413) (bb1aebe)

v0.21.2

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Full Changelog: v0.21.1...v0.21.2

Documentation

• readme: consistent use of sentence case in headings (#​405) (495ca87)
• readme: document how to make undocumented requests (#​407) (b046d0d)

v0.21.1

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Full Changelog: v0.21.0...v0.21.1

Chores

• internal: loosen input type for util function (#​402) (9a6ca55)

v0.21.0

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Full Changelog: v0.20.0...v0.21.0

Features

• vertex: api is no longer in private beta (#​399) (4cb0e64)

Performance Improvements

• cache TypeAdapters (#​396) (a902c47)

Chores

• internal: update generated pragma comment (#​398) (330b61e)

Documentation

• fix typo in CONTRIBUTING.md (#​397) (d46629f)
• helpers: fix example code (#​391) (9fe0c8b)

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