build(deps): bump ruff from 0.15.11 to 0.15.12 in /pydantic-ai (#77)

Bumps [ruff](https://github.com/astral-sh/ruff) from 0.15.11 to 0.15.12.
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](astral-sh/ruff@0.15.11...0.15.12)

---
updated-dependencies:
- dependency-name: ruff
  dependency-version: 0.15.12
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pydantic-ai/pyproject.toml

@@ -16,7 +16,7 @@ test = [
 ]
 dev = [
     "bolt-python-support-agent-pydantic[test]",
-    "ruff==0.15.11",
+    "ruff==0.15.12",
 ]
 
 [tool.setuptools.packages.find]