build(deps): bump the pip group across 2 directories with 1 update

Bumps the pip group with 1 update in the /packages/typespec-python directory: [black](https://github.com/psf/black).
Bumps the pip group with 1 update in the /packages/typespec-python/tests/requirements directory: [black](https://github.com/psf/black).


Updates `black` from 24.4.0 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@24.4.0...26.3.1)

Updates `black` from 24.4.0 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@24.4.0...26.3.1)

Updates `black` from 24.4.0 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@24.4.0...26.3.1)

Updates `black` from 24.4.0 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@24.4.0...26.3.1)

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

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

Author: dependabot[bot]

packages/typespec-python/dev_requirements.txt

@@ -8,7 +8,7 @@ colorama==0.4.6
 debugpy==1.8.2
 pytest==9.0.3
 coverage==7.6.1
-black==24.4.0
+black==26.3.1
 ptvsd==4.3.2
 types-PyYAML==6.0.12.8
 

packages/typespec-python/tests/requirements/lint.txt

@@ -1,4 +1,4 @@
 # Linting dependencies
 -r base.txt
 pylint==4.0.4
-black==24.4.0
+black==26.3.1