[deps] Update cssselect requirement from ~=1.3.0 to ~=1.4.0

Updates the requirements on [cssselect](https://github.com/scrapy/cssselect) to permit the latest version.
- [Changelog](https://github.com/scrapy/cssselect/blob/master/CHANGES)
- [Commits](scrapy/cssselect@v1.3.0...v1.4.0)

---
updated-dependencies:
- dependency-name: cssselect
  dependency-version: 1.4.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Federico Capoano <f.capoano@openwisp.io>

Author: dependabot[bot]

requirements-test.txt

@@ -8,7 +8,7 @@ django-extensions
 openwisp-utils[qa,selenium,channels-test] @ https://github.com/openwisp/openwisp-utils/archive/refs/heads/1.3.tar.gz
 pylinkvalidator
 lxml~=6.0.2
-cssselect~=1.3.0
+cssselect~=1.4.0
 openwisp-monitoring @ https://github.com/openwisp/openwisp-monitoring/archive/refs/heads/1.3.tar.gz
 django-redis~=6.0.0
 mock-ssh-server~=0.9.1