Rename sanity.sh to validate.sh

[adam-fowler]

No description provided.

[codecov-commenter]

Codecov Report

Merging #96 (9137c15) into main (a16a3db) will increase coverage by 1.58%.
The diff coverage is n/a.

❗ Current head 9137c15 differs from pull request most recent head 8f7cb93. Consider uploading reports for the commit 8f7cb93 to get more accurate results

@@            Coverage Diff             @@
##             main      #96      +/-   ##
==========================================
+ Coverage   78.87%   80.46%   +1.58%     
==========================================
  Files          22       21       -1     
  Lines        2372     2211     -161     
==========================================
- Hits         1871     1779      -92     
+ Misses        501      432      -69     

Impacted Files	Coverage Δ
...s/MQTTNIO/ChannelHandlers/MQTTMessageDecoder.swift	78.37% <0.00%> (-5.41%)	⬇️
Sources/MQTTNIO/MQTTConnection.swift	92.07% <0.00%> (-1.22%)	⬇️
Sources/MQTTNIO/MQTTClient.swift	82.70% <0.00%> (-0.38%)	⬇️
Sources/MQTTNIO/TSTLSConfiguration.swift

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