build(deps): update validators requirement

Updates the requirements on [validators](https://github.com/python-validators/validators) to permit the latest version.
- [Release notes](https://github.com/python-validators/validators/releases)
- [Changelog](https://github.com/python-validators/validators/blob/master/CHANGES.md)
- [Commits](python-validators/validators@0.20.0...0.33.0)

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

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

requirements/testing.txt

@@ -4,4 +4,4 @@
 Pillow>=10.2,<11
 pytest-cov>=4
 pytest-retry>=1.6
-validators>=0.20,<0.29
+validators>=0.20,<0.34