Changed VALID_REALMS field from 'atmosphere' to 'atmos'

[CodeGat]

Noting error here: https://github.com/ACCESS-NRI/access-esm1.5-configs/pull/43/checks?check_run_id=28637397532

In this PR:

• Updated the VALID_REALMS to their CMIP7 equivalents
• Update version to 0.0.6

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.48%. Comparing base (8f2fb04) to head (f2f37d9).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #46   +/-   ##
=======================================
  Coverage   73.48%   73.48%           
=======================================
  Files          15       15           
  Lines         724      724           
=======================================
  Hits          532      532           
  Misses        192      192           

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[jo-basevi]

LGTM