feat: Use mirror to fix rate limit issue

[astuyve]

What does this PR do?

Build and integration tests occasionally fail with rate limit errors, because I used the wrong URL:

Motivation

Testing Guidelines

Additional Notes

Types of Changes

• [ ] Bug fix
• [ ] New feature
• [ ] Breaking change
• [ ] Misc (docs, refactoring, dependency upgrade, etc.)

Check all that apply

• [ ] This PR's description is comprehensive
• [ ] This PR contains breaking changes that are documented in the description
• [ ] This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
• [ ] This PR impacts documentation, and it has been updated (or a ticket has been logged)
• [ ] This PR's changes are covered by the automated tests
• [ ] This PR collects user input/sensitive content into Datadog
• [ ] This PR passes the integration tests (ask a Datadog member to run the tests)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 82.10%. Comparing base (f06e18b) to head (3190714).

:exclamation: Current head 3190714 differs from pull request most recent head 4a85c3a. Consider uploading reports for the commit 4a85c3a to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #497 +/- ## ======================================= Coverage 82.10% 82.10% ======================================= Files 54 54 Lines 2191 2191 Branches 511 511 ======================================= Hits 1799 1799 Misses 329 329 Partials 63 63 ```

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