Docker: Remove deprecated version attribute

[0xPoe]

You can find these warnings when you run docker-compose:

❯ docker-compose up -d
WARN[0000] /Volumes/t7/code/crates.io/docker-compose.yml: the attribute `version` is obsolete, it will be ignored, please remove it to avoid potential confusion 
WARN[0000] /Volumes/t7/code/crates.io/docker-compose.override.yml: the attribute `version` is obsolete, it will be ignored, please remove it to avoid potential confusion 

See more at: https://docs.docker.com/reference/compose-file/version-and-name/#version-top-level-element-obsolete

[0xPoe]

🔢 Self-check (PR reviewed by myself and ready for feedback.)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.57%. Comparing base (3f611b9) to head (517d413).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10155   +/-   ##
=======================================
  Coverage   89.57%   89.57%           
=======================================
  Files         295      295           
  Lines       31690    31690           
=======================================
  Hits        28386    28386           
  Misses       3304     3304           

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