pip-rest: bump black in /client-samples/python/rest in the pip group

Bumps the pip group in /client-samples/python/rest with 1 update: [black](https://github.com/psf/black).


Updates `black` from 23.11.0 to 24.3.0
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](psf/black@23.11.0...24.3.0)

---
updated-dependencies:
- dependency-name: black
  dependency-type: direct:production
  dependency-group: pip
...

Signed-off-by: dependabot[bot] <[email protected]>

client-samples/python/rest/requirements.txt

@@ -1,4 +1,4 @@
-black==23.11.0
+black==24.3.0
 chardet==3.0.4
 msal==1.25.0
 parameterized==0.9.0