Version bump - 0.4.2

[JackUrb]

Updating version to 0.4.2 to have a release bump. Getting #637 and #636 in for ParlAI folks primarily.

[codecov-commenter]

Codecov Report

Merging #638 (9ff9ac8) into main (69c0560) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #638      +/-   ##
==========================================
- Coverage   63.16%   63.11%   -0.05%     
==========================================
  Files          86       86              
  Lines        8263     8263              
==========================================
- Hits         5219     5215       -4     
- Misses       3044     3048       +4     

Impacted Files	Coverage Δ
mephisto/operations/supervisor.py	79.00% <0.00%> (-1.30%)	⬇️
...tractions/architects/channels/websocket_channel.py	82.55% <0.00%> (+2.32%)	⬆️

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