CI: Update to Docker Compose V2

[amotl]

Problem

docker-compose: command not found

Apparently, GHA phased out the Docker Compose v1 CLI.

References

• Chore(deps): Update pyproject-fmt requirement from <2.2 to <2.3 #81

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.29%. Comparing base (17d5c4e) to head (945833f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #82   +/-   ##
=======================================
  Coverage   83.29%   83.29%           
=======================================
  Files          27       27           
  Lines         946      946           
=======================================
  Hits          788      788           
  Misses        158      158           

Flag	Coverage Δ
unittests	83.29% <ø> (ø)

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