Updated pluggable-discovery-protocol-handler library

[cmaglie]

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• 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 arduino/pluggable-discovery-protocol-handler#50
Fix #2665

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.65%. Comparing base (23d5036) to head (d7d429a).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2707      +/-   ##
==========================================
- Coverage   67.67%   67.65%   -0.02%     
==========================================
  Files         234      234              
  Lines       22207    22207              
==========================================
- Hits        15028    15025       -3     
- Misses       5998     6000       +2     
- Partials     1181     1182       +1     

Flag	Coverage Δ
unit	67.65% <ø> (-0.02%)	⬇️

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