Bump moto from 5.1.15 to 5.1.16

Bumps [moto](https://github.com/getmoto/moto) from 5.1.15 to 5.1.16.
- [Release notes](https://github.com/getmoto/moto/releases)
- [Changelog](https://github.com/getmoto/moto/blob/master/CHANGELOG.md)
- [Commits](getmoto/moto@5.1.15...5.1.16)

---
updated-dependencies:
- dependency-name: moto
  dependency-version: 5.1.16
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

testproject/requirements_test.txt

@@ -1,5 +1,5 @@
 cryptography==46.0.2
-moto==5.1.15
+moto==5.1.16
 Flask==3.1.2
 Flask-Cors==6.0.1
 psycopg==3.2.12