chore: use object format for repository field in package.json

[yoshinorin]

What does it do?

Update a package.json repository field to object format. While it's unclear when this format became available, npm documentation has used it since at least v6.

Screenshots

N/A

Pull request tasks

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

[github-actions]

How to test

git clone -b chore/update-package.json-repo-field https://github.com/hexojs/hexo.git
cd hexo
npm install
npm test

[coveralls]

Pull Request Test Coverage Report for Build 18818002556

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 99.529%

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Totals
Change from base Build 18817528407:	0.0%
Covered Lines:	9935
Relevant Lines:	9982

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💛 - Coveralls