fix: handle network being temporarily unavailable

[bdraco]

fixes #54

[codecov]

Codecov Report

Attention: Patch coverage is 73.80952% with 11 lines in your changes missing coverage. Please review.

Project coverage is 86.90%. Comparing base (0934a7d) to head (1522c9f).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/aiodhcpwatcher/__init__.py	73.80%	6 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #57      +/-   ##
==========================================
- Coverage   88.37%   86.90%   -1.47%     
==========================================
  Files           1        1              
  Lines         129      168      +39     
  Branches       14       20       +6     
==========================================
+ Hits          114      146      +32     
- Misses         10       12       +2     
- Partials        5       10       +5     

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