chore(deps): bump @ai-sdk/anthropic from 3.0.84 to 4.0.21

Bumps [@ai-sdk/anthropic](https://github.com/vercel/ai/tree/HEAD/packages/anthropic) from 3.0.84 to 4.0.21.
- [Release notes](https://github.com/vercel/ai/releases)
- [Changelog](https://github.com/vercel/ai/blob/main/packages/anthropic/CHANGELOG.md)
- [Commits](https://github.com/vercel/ai/commits/@ai-sdk/anthropic@4.0.21/packages/anthropic)

---
updated-dependencies:
- dependency-name: "@ai-sdk/anthropic"
  dependency-version: 4.0.16
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pnpm-lock.yaml

@@ -76,7 +76,7 @@ peerDependencyRules:
     '@ai-sdk/ui-utils@1.2.11>zod': '^4.0.0'
 
 catalog:
-  '@ai-sdk/anthropic': 3.0.84
+  '@ai-sdk/anthropic': 4.0.21
   '@ai-sdk/deepseek': 2.0.39
   '@ai-sdk/google': 3.0.82
   '@ai-sdk/openai': 3.0.71