Bump moto from 4.0.13 to 5.0.3

Bumps [moto](https://github.com/getmoto/moto) from 4.0.13 to 5.0.3.
- [Release notes](https://github.com/getmoto/moto/releases)
- [Changelog](https://github.com/getmoto/moto/blob/master/CHANGELOG.md)
- [Commits](getmoto/moto@4.0.13...5.0.3)

---
updated-dependencies:
- dependency-name: moto
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

requirements/testing.txt

@@ -15,6 +15,6 @@ psutil>=5,<6
 #  used only under slack_sdk/*_store
 boto3<=2
 # For AWS tests
-moto==4.0.13; python_version=="3.6"
+moto==5.0.3; python_version=="3.6"
 moto<5; python_version=="3.7"
 moto<6