Update black requirement from ~=25.1 to ~=26.3

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@25.1.0...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>

Author: dependabot[bot]

pyproject.toml

@@ -105,7 +105,7 @@ build = [
     "build~=1.2",
     "isort~=7.0",
     "mypy[mypyc]~=1.15",
-    "black[jupyter]~=25.1",
+    "black[jupyter]~=26.3",
     "towncrier~=25.8",
     "bump-my-version~=1.1",
 ]