Updated pluggable-discovery-protocol-handler library

[cmaglie]

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• [X] The PR has no duplicates (please search among the Pull Requests before creating one)
• [X] The PR follows our contributing guidelines
• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)
• [ ] UPGRADING.md has been updated with a migration guide (for breaking changes)
• [ ] configuration.schema.json updated if new parameters are added.

What kind of change does this PR introduce?

Updates the pluggable-discovery client library.

What is the current behavior?

In some circumstances the pluggable-discovery client panics (in particular if the discovery crashes on startup).

What is the new behavior?

The crashing discovery is handled gracefully.

Does this PR introduce a breaking change, and is titled accordingly?

No

Other information

Upstream fix https://github.com/arduino/pluggable-discovery-protocol-handler/pull/50 Fix #2665

[codecov[bot]]

Codecov Report

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

Project coverage is 67.68%. Comparing base (23d5036) to head (d57a042). Report is 3 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2707 +/- ## ======================================= Coverage 67.67% 67.68% ======================================= Files 234 234 Lines 22207 22285 +78 ======================================= + Hits 15028 15083 +55 - Misses 5998 6017 +19 - Partials 1181 1185 +4 ``` | [Flag](https://app.codecov.io/gh/arduino/arduino-cli/pull/2707/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=arduino) | Coverage Δ | | |---|---|---| | [unit](https://app.codecov.io/gh/arduino/arduino-cli/pull/2707/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=arduino) | `67.68% <ø> (+<0.01%)` | :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=arduino#carryforward-flags-in-the-pull-request-comment) to find out more.

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