Fix `tests.test_cli` failing because of outdated mocks

7 jobs for feat-randomforest in 5 minutes and 46 seconds
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lint:pylint Lint
import random
import typing (duplicate-code)

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lint:mypy Lint
gecco/cli/commands/train.py:191: error: No overload variant of "write" of "BinaryIO" matches argument type "str"
gecco/cli/commands/train.py:191: note: Possible overload variants:
gecco/cli/commands/train.py:191: note: def write(self, s: bytearray) -> int
gecco/cli/commands/train.py:191: note: def write(self, s: bytes) -> int
gecco/cli/commands/train.py:235: error: unused 'type: ignore' comment
Found 5 errors in 3 files (checked 24 source files)
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