test: Ignore CERN Twiki URLs during Sphinx linkcheck

[matthewfeickert]

Description

Ignore URLs for CERN's Twiki instance https://twiki.cern.ch/ from Sphinx linkcheck tests as CERN seems to have problems regularly maintaining their SSL certs which can lead to SSL errors.

Example:

Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1002)'))

Checklist Before Requesting Reviewer

• Tests are passing
• "WIP" removed from the title of the pull request
• Selected an Assignee for the PR to be responsible for the log summary

Before Merging

For the PR Assignees:

• Summarize commit messages into a comprehensive review of the PR

* Ignore URLs for CERN's Twiki instance https://twiki.cern.ch/ from
  Sphinx linkcheck tests as CERN seems to have problems regularly
  maintaining their SSL certs which can lead to SSL errors.

  Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED]
  certificate verify failed: unable to get local issuer certificate (_ssl.c:1002)'))

[matthewfeickert]

As @PerilousApricot pointed out, seems like this time was due to an error in an attempt to update the certs

[matthewfeickert]

I'm going to approve and merge this myself (as I'm the person who is responsible for fixing linkcheck as I added this test). As always, PRs approved by a single core dev can be reverted as needed by the rest of the dev team.