DGOV-644: EFAS v6.0 configuration added

[rdosinski]

Description

A version v6.0 as configuration for the EFAS hydrological data is needed. This PR is to add v6.0 to the configuration part of the language.yaml.

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.41%. Comparing base (e9e99a9) to head (7de32d4).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #227   +/-   ##
========================================
  Coverage    55.41%   55.41%           
========================================
  Files          322      322           
  Lines        13792    13792           
  Branches      1102     1102           
========================================
  Hits          7643     7643           
  Misses        6149     6149           

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