docs: add borrull as a contributor for code, and test

[allcontributors]

Adds @borrull as a contributor for code, test.

This was requested by jonaslagoni in this comment

[netlify]

✅ Deploy Preview for modelina canceled.

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🔍 Latest deploy log	https://app.netlify.com/sites/modelina/deploys/6668052dd51d1b0008da870c

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[coveralls]

Pull Request Test Coverage Report for Build 9461856753

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

• 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 92.303%

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Totals
Change from base Build 9382165682:	0.0%
Covered Lines:	5996
Relevant Lines:	6327

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💛 - Coveralls

[asyncapi-bot]

🎉 This PR is included in version 3.5.3 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀