Update moto requirement from <5.0.0 to <6.0.0 in /requirements

Updates the requirements on [moto](https://github.com/getmoto/moto) to permit the latest version.
- [Release notes](https://github.com/getmoto/moto/releases)
- [Changelog](https://github.com/getmoto/moto/blob/master/CHANGELOG.md)
- [Commits](getmoto/moto@4.2.8...5.0.1)

---
updated-dependencies:
- dependency-name: moto
  dependency-type: direct:production
...

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

requirements/dev.txt

@@ -6,7 +6,7 @@ google_compute_engine # Need this because boto has issues with dynamic package l
 ipython>=5.0
 ipywidgets
 notebook
-moto <5.0.0
+moto <6.0.0
 pytest>=4.1
 pytest-cov>=2.6.1
 pytest-mock>=1.10