This is a follow up fixture found during review of
<https://issues.guix.gnu.org/73070>.
* gnu/packages/python-web.scm (python-scrapy): Update to 2.11.2.
[source]: Name for source tarball has been changed in PyPI.
[arguments]: <#:test-flags>: Enable more tests which are passing now.
<#:phases>: Add 'relax-requirements and 'prepare-test-environment phases.
[propagated-inputs]: Add python-defusedxml.
[native-inputs]: Add nss-certs-for-test.
Change-Id: Ia1e1868b75d679044af83812469c2412b2bab716