fix(external_link): noopenner should be noopener

[stevenjoezhang]

What does it do?

See #5706 (comment)

Screenshots

Pull request tasks

• Add test cases for the changes.
• Passed the CI test.

[github-actions]

How to test

git clone -b external_link https://github.com/hexojs/hexo.git
cd hexo
npm install
npm test

[yoshinorin]

We also have to fix these:

hexo/test/scripts/filters/external_link.ts

Line 59 in 3634960

'<a rel="noopenner" href="https://hexo.io/">Hexo</a>',

and

hexo/test/scripts/filters/external_link.ts

Line 62 in 3634960

'<a href="https://hexo.io/" rel="external noopenner">Hexo</a>',

[coveralls]

Pull Request Test Coverage Report for Build 20660067499

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 2 of 2 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 99.489%

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Totals
Change from base Build 18971852506:	0.0%
Covered Lines:	9938
Relevant Lines:	9989

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💛 - Coveralls

[yoshinorin]

LGTM 👍