Bump black from 24.10.0 to 26.3.1

Bumps [black](https://github.com/psf/black) from 24.10.0 to 26.3.1.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](psf/black@24.10.0...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>

Author: dependabot[bot]

poetry.lock

@@ -18,7 +18,7 @@ pytest-nhsd-apim = "^5.0.0"
 
 [tool.poetry.group.dev.dependencies]
 flake8 = "^3.7.9"
-black = "^24.3.0"
+black = "^26.3.1"
 pip-licenses = "^2.0.1"
 jinja2 = "^3.1.6"
 pyyaml = "^6.0.3"