chore(deps): Bump pydantic-ai in /a2a/a2a_contact_extractor

Bumps [pydantic-ai](https://github.com/pydantic/pydantic-ai) from 1.106.0 to 2.8.0.
- [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@v1.106.0...v2.8.0)

---
updated-dependencies:
- dependency-name: pydantic-ai
  dependency-version: 2.8.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

a2a/a2a_contact_extractor/pyproject.toml

@@ -12,7 +12,7 @@ dependencies = [
     "starlette>=1.3.1",        # Indirect; prevents CVE-2025-62727
     "mcp>=1.28.1",              # Indirect; prevents CVE-2025-66416
     "pyasn1>=0.6.3",            # Indirect; prevents CVE-2026-30922
-    "pydantic-ai>=1.106.0",      # Indirect; prevents CVE-2026-25580
+    "pydantic-ai>=2.8.0",      # Indirect; prevents CVE-2026-25580
     "filelock>=3.29.5",         # Indirect; prevents CVE-2025-68146
     "fastmcp>=3.4.2",           # Indirect; prevents CVE-2026-32871 (critical), CVE-2026-27124 (high)
     "anthropic>=0.116.0",        # Indirect; prevents CVE-2026-34452, CVE-2026-34450