docs: update changelog for integrations/google_ai (#1812)

* Update changelog for integrations/google_ai

* Update CHANGELOG.md

---------

Co-authored-by: wochinge <7667273+wochinge@users.noreply.github.com>
Co-authored-by: Stefano Fiorucci <stefanofiorucci@gmail.com>

Author: 3 people

integrations/google_ai/CHANGELOG.md

@@ -1,5 +1,36 @@
 # Changelog
 
+## [integrations/google_ai-v5.2.0] - 2025-05-27
+
+### 🚀 Features
+
+- Add run_async for GoogleAIGeminiChatGenerator (#1543)
+
+### 🐛 Bug Fixes
+
+- Update serialization/deserialization tests to add new parameter `connection_type_validation` (#1464)
+
+### 🧪 Testing
+
+- Change model from unsupported gemini-pro to gemini-1.5-pro (#1436)
+- Update tool serialization in tests to include `inputs_from_state` and `outputs_to_state` (#1581)
+- Upgrade gemini models (#1617)
+
+### ⚙️ CI
+
+- Review testing workflows (#1541)
+
+### 🧹 Chores
+
+- Use Haystack logging across integrations (#1484)
+- Update ChatGenerators with `deserialize_tools_or_toolset_inplace` (#1623)
+
+### 🌀 Miscellaneous
+
+- Chore: remove `jsonschema` dependency from `default` environment (#1368)
+- Test: Update tests to check for `outputs_to_string` in Tool when running haystack-ai>=2.12 (#1585)
+- Ci: Update to `GoogleAIGeminiGenerator` tests (#1648)
+
 ## [integrations/google_ai-v5.1.0] - 2025-01-30
 
 ### 🚀 Features