Update proxy

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 17.39130% with 19 lines in your changes missing coverage. Please review.

Project coverage is 89.37%. Comparing base (30f9a97) to head (862234c). Report is 26 commits behind head on main.

Files	Patch %	Lines
pyleco/coordinators/proxy_server.py	17.39%	19 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #86 +/- ## ========================================== + Coverage 89.04% 89.37% +0.33% ========================================== Files 36 36 Lines 2902 2937 +35 Branches 355 363 +8 ========================================== + Hits 2584 2625 +41 + Misses 267 261 -6 Partials 51 51 ``` | [Flag](https://app.codecov.io/gh/pymeasure/pyleco/pull/86/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pymeasure) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/pymeasure/pyleco/pull/86/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pymeasure) | `89.37% <17.39%> (+0.33%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pymeasure#carryforward-flags-in-the-pull-request-comment) to find out more.

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