build(deps): bump black from 26.1.0 to 26.3.1 (#5619)

Bumps [black](https://github.com/psf/black) from 26.1.0 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@26.1.0...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>
Co-authored-by: ilayda-cp <ilayda.cavusoglupars@canonical.com>

Author: dependabot[bot]

requirements.txt

@@ -32,5 +32,5 @@ sentry-sdk==2.52.0
 # Development dependencies
 Flask-Testing==0.8.1
 freezegun==1.5.5
-black==26.1.0
+black==26.3.1
 flake8==7.3.0