Bump black from 23.10.1 to 26.3.1 (#194)

Bumps [black](https://github.com/psf/black) from 23.10.1 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@23.10.1...26.3.1)

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

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

Author: dependabot[bot]

requirements.txt

@@ -1,6 +1,6 @@
 ariadne==0.25.2
 asyncpg==0.31.0
-black==23.10.1
+black==26.3.1
 fastapi==0.136.3
 flake8==6.1.0
 httpx==0.26.0