Add explicit timeout for subscriber creation

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 66.66667% with 3 lines in your changes missing coverage. Please review.

Project coverage is 92.83%. Comparing base (9ead159) to head (2632a5a).

Files	Patch %	Lines
google_nest_sdm/google_nest_subscriber.py	66.66%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1029      +/-   ##
==========================================
- Coverage   92.97%   92.83%   -0.14%     
==========================================
  Files          19       19              
  Lines        1821     1829       +8     
==========================================
+ Hits         1693     1698       +5     
- Misses        128      131       +3     

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