chore(deps): update dependency anthropic to v0.28.0 (GoogleCloudPlatform#11812)

* chore(deps): update dependency anthropic to v0.28.0

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generative_ai/requirements.txt

@@ -4,7 +4,7 @@ pillow==9.5.0; python_version < '3.8'
 pillow==10.3.0; python_version >= '3.8'
 google-cloud-aiplatform[pipelines,rapid_evaluation,reasoningengine]==1.56.0
 google-auth==2.29.0
-anthropic[vertex]==0.25.6
+anthropic[vertex]==0.28.0
 langchain-core==0.1.52
 langchain-google-vertexai==1.0.3
 openai==1.30.5