deps: update black requirement from <26 to <27

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@18.3a0...26.5.1)

---
updated-dependencies:
- dependency-name: black
  dependency-version: 26.5.1
  dependency-type: direct:development
...

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

Author: dependabot[bot]

pyproject.toml

@@ -33,7 +33,7 @@ dependencies = [
 [project.optional-dependencies]
 dev = [
   "bandit[toml]<2",
-  "black<26",
+  "black<27",
   "pyright<2",
   "pytest<10",
   "pytest-benchmark<6",