update openapi specs for different targets of balancing strategy

[ersi-lightly]

Changes generated Python client for the REST-API in order to account for the possibility to have as target:

• uniform
• input at the balancing selection strategy.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 81.96%. Comparing base (80fa5b5) to head (5355f62).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1533 +/- ## ========================================== + Coverage 81.94% 81.96% +0.02% ========================================== Files 144 144 Lines 6075 6094 +19 ========================================== + Hits 4978 4995 +17 - Misses 1097 1099 +2 ```

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