Relax Wi-Fi rssi & encryption parameters

[frenck]

Proposed Changes

Relaxes the rssi and encryption reported values. Multiple reports came in, where those two have been missing (or None).

They are not critical, so relaxing their validation in this PR.

fixes #223
Ref:

• LaMetric Time suddenly throws an error on HASS startup home-assistant/core#78605
• Not able to connect Lametric Time with the new integration home-assistant/core#77980
• Lametric 2022.9.0 update Failed to initialize notification service lametric home-assistant/core#78079

[codecov-commenter]

Codecov Report

Merging #226 (1837a4b) into main (35e5bf1) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #226   +/-   ##
=======================================
  Coverage   96.04%   96.04%           
=======================================
  Files           6        6           
  Lines         354      354           
  Branches       52       52           
=======================================
  Hits          340      340           
  Misses         12       12           
  Partials        2        2           

Impacted Files	Coverage Δ
src/demetriek/models.py	93.75% <100.00%> (ø)

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