Bump anthropic[vertex] from 0.38.0 to 0.39.0

Bumps [anthropic[vertex]](https://github.com/anthropics/anthropic-sdk-python) from 0.38.0 to 0.39.0.
- [Release notes](https://github.com/anthropics/anthropic-sdk-python/releases)
- [Changelog](https://github.com/anthropics/anthropic-sdk-python/blob/main/CHANGELOG.md)
- [Commits](anthropics/anthropic-sdk-python@v0.38.0...v0.39.0)

---
updated-dependencies:
- dependency-name: anthropic[vertex]
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -1,3 +1,3 @@
 google-cloud-aiplatform==1.71.1
-anthropic[vertex]==0.38.0
+anthropic[vertex]==0.39.0
 litellm[proxy]==1.51.3