Bump restrictedpython from 7.2 to 7.3 (#4107)

Bumps [restrictedpython](https://github.com/zopefoundation/RestrictedPython) from 7.2 to 7.3.
- [Changelog](https://github.com/zopefoundation/RestrictedPython/blob/master/CHANGES.rst)
- [Commits](zopefoundation/RestrictedPython@7.2...7.3)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements_test.txt

@@ -6,4 +6,4 @@ pytest-asyncio==0.24.0
 pytest-cov==5.0.0
 pytest-snapshot==0.9.0
 pytest-socket==0.7.0
-RestrictedPython==7.2
+RestrictedPython==7.3