💬 Overrides InterceptorState.toString()

[AlexV525]

Resolves #2226

New Pull Request Checklist

• I have read the Documentation
• I have searched for a similar pull request in the project and found none
• I have updated this branch with the latest main branch to avoid conflicts (via merge from master or rebase)
• I have added the required tests to prove the fix/feature I'm adding
• I have updated the documentation (if necessary)
• I have run the tests without failures
• I have updated the CHANGELOG.md in the corresponding package

[github-actions]

Code Coverage Report: Only Changed Files listed

Package	Base Coverage	New Coverage	Difference
dio/lib/src/dio_exception.dart	🟠 71.93%	🟢 92.98%	🟢 21.05%
dio/lib/src/interceptor.dart	🟢 97.58%	🟢 97.62%	🟢 0.04%
Overall Coverage	🟢 81.28%	🟢 82.06%	🟢 0.78%

Minimum allowed coverage is 0%, this run produced 82.06%

[ueman]

LGTM