build(deps-dev): update black requirement from ^26.1.0 to ^26.3.1 (#413)

Updates the requirements on [black](https://github.com/psf/black) to permit the latest version.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](psf/black@26.1.0...26.3.1)

---
updated-dependencies:
- dependency-name: black
  dependency-version: 26.3.1
  dependency-type: direct:development
...

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

Author: dependabot[bot]

pyproject.toml

@@ -15,7 +15,7 @@ aws-xray-sdk = "^2.15.0"
 
 
 [tool.poetry.group.dev.dependencies]
-black = "^26.1.0"
+black = "^26.3.1"
 ruff = "^0.15.0"
 pytest = "^9.0.0"
 pytest-mock = "^3.15.1"