test: re-enable client certificate test

[jarhodes314]

Proposed changes

Remove the #[ignore] attribute on one of the client certificate tests. Due to a change in the underlying certificate verifier, the error rustls produces is slightly different to what it was previously, and this was causing the test to fail. We aren't interested in the specifics of the error message produced, we simply care that the error arose from the client certificate verification and not some bug in the test code. Having updated the test to check for the updated error, I've verified that it still fails for otherwise failing connections (e.g. the client not trusting the server certificate). Therefore I think a simple update to the test to reflect the new behaviour is sufficient here.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Improvement (general improvements like code refactoring that doesn't explicitly fix a bug or add any new functionality)
• Documentation Update (if none of the other choices apply)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Paste Link to the issue

• Fix acceptor_rejects_untrusted_client_certificates following hyper upgrade #3375

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA (in all commits with git commit -s)
• I ran cargo fmt as mentioned in CODING_GUIDELINES
• I used cargo clippy as mentioned in CODING_GUIDELINES
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Additional details and impacted files

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[github-actions]

Robot Results

✅ Passed	❌ Failed	⏭️ Skipped	Total	Pass %	⏱️ Duration
570	0	3	570	100	1h33m56.103344s

[didier-wenzek]

Approved