Update all dependencies to latest versions and run quality checks

- Update core frameworks: google-adk 1.16→1.21, strands-agents 1.13→1.20
- Update AI providers: anthropic 0.71→0.75, openai→2.14, mcp 1.17→1.25
- Update LangChain ecosystem: langchain→1.2, langgraph→1.0.5
- Update utilities with version pins for reproducibility
- Run ruff formatter on codebase (13 files reformatted)
- Add comprehensive DEPENDENCY_UPDATE_REPORT.md with analysis
- No critical breaking changes detected, minor type issues documented

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: jwesleye

AWS_Strands/DeepResearch_Dave/__init__.py

@@ -13,8 +13,8 @@
 
 __all__ = [
     "DeepResearchDave",
-    "create_agent", 
+    "create_agent",
     "ResearchSession",
     "SYSTEM_PROMPT",
-    "root_agent"
-]
+    "root_agent",
+]