build(deps): bump anthropic from 0.76.0 to 0.84.0

Bumps [anthropic](https://github.com/anthropics/anthropic-sdk-python) from 0.76.0 to 0.84.0.
- [Release notes](https://github.com/anthropics/anthropic-sdk-python/releases)
- [Changelog](https://github.com/anthropics/anthropic-sdk-python/blob/main/CHANGELOG.md)
- [Commits](https://github.com/anthropics/anthropic-sdk-python/compare/v0.76.0...v0.84.0)

---
updated-dependencies:
- dependency-name: anthropic
  dependency-version: 0.84.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -1,4 +1,4 @@
-anthropic==0.76.0
+anthropic==0.84.0
 google-genai==0.1.0
 jinja2==3.1.6
 openai==2.15.0