Add a little delay to the Mosquitto fixture

[amotl]

Problem

Possibly faster GitHub runners made MQTT software tests fail on the LorryStream project.

Solution

Add a little delay.

References

• Carabas: Kinesis, DynamoDB, DMS - CDC record processing in different flavours daq-tools/lorrystream#120
• Documentation: Add introduction to the Singer ecosystem daq-tools/lorrystream#122

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.73%. Comparing base (3e410fb) to head (d1e05c2).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #22      +/-   ##
==========================================
+ Coverage   95.70%   95.73%   +0.02%     
==========================================
  Files           5        5              
  Lines         163      164       +1     
==========================================
+ Hits          156      157       +1     
  Misses          7        7              

Flag	Coverage Δ
unittests	95.73% <100.00%> (+0.02%)	⬆️

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