Force 127.0.0.1 host to be used for local tests

[biosvs]

Currently, if no listen addr is provided, first local interface is used, which is not desirable behaviour (especially for TLS tests where we're creating certificates exactly for 127.0.0.1)

• [ ] Description and context for reviewers: one partner, one stranger
• [ ] Docs (package doc)
• [ ] Entry in CHANGELOG.md

[codecov[bot]]

Codecov Report

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

Project coverage is 85.24%. Comparing base (31a6e88) to head (7eb49fa). Report is 1 commits behind head on dev.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #2321 +/- ## ========================================== - Coverage 85.25% 85.24% -0.01% ========================================== Files 271 271 Lines 15598 15598 ========================================== - Hits 13298 13297 -1 - Misses 1877 1878 +1 Partials 423 423 ```

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