chore: update pydantic-ai-slim[google,openai] requirement

Updates the requirements on [pydantic-ai-slim[google,openai]](https://github.com/pydantic/pydantic-ai) to permit the latest version.
- [Release notes](https://github.com/pydantic/pydantic-ai/releases)
- [Changelog](https://github.com/pydantic/pydantic-ai/blob/main/docs/changelog.md)
- [Commits](pydantic/pydantic-ai@v1.0.0...v2.0.0)

---
updated-dependencies:
- dependency-name: pydantic-ai-slim[google,openai]
  dependency-version: 2.0.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

pyproject.toml

@@ -12,7 +12,7 @@ dependencies = [
     "stamina>=25.1.0,<27.0.0",
     "pydantic-settings<3.0.0,>=2.9.1",
     "tomlkit<1.0.0,>=0.13.3",
-    "pydantic-ai-slim[google,openai]>=1.0.0,<2.0.0",
+    "pydantic-ai-slim[google,openai]>=1.0.0,<3.0.0",
 ]
 name = "lightman_ai"
 description = "LLM-powered cybersecurity news aggregator."