CI fix: ESPHome no longer prefers plaintext

[puddly]

A unit test expected ESPHome to explicitly error out when connecting via plaintext to an encrypted server without a key. This is no longer the case in more recent aioesphomeapi versions.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.44%. Comparing base (dfdb242) to head (8ba7ee2).
⚠️ Report is 2 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #110      +/-   ##
==========================================
+ Coverage   92.35%   92.44%   +0.08%     
==========================================
  Files          22       22              
  Lines        3661     3704      +43     
==========================================
+ Hits         3381     3424      +43     
  Misses        280      280              

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